Author's note: This story includes explicit sexual content, involving descriptions of contact between girls and boys below the age of consent. If you find this in any way offensive or distasteful, please read no further, and/or if it is illegal for you to read such material in your jurisdiction due to age or domicile, please read no further. The author does not condone or promote any illegal activity. This story is entirely a product of my imagination, no minors were involved in any way in its compilation, and the characters and actions portrayed are entirely fictitious. The characters in this story may not engage in safe sex, because, being fictitious, they don't need to. You, as a real person, do.
****
"I can't believe your mum and dad let us do this! It'll be brilliant!"
"And I can't believe your mum let you do it with us! We've asked her loads of times if we can have a sleepover together, but she's always said no."
"I think it's because your mum rang her, and said it was for charity, and we wouldn't be outside, or anything. It's such a great den, too! Did you make it?"
"Robin and I did it together, and Dad helped us, too, moving the furniture and that kind of stuff. Mum sorted all the bedding out, and found those old curtains in the airing cupboard for the roof of the den. She's got us loads of snacks and things as well. This is going to be great!"
"Well....yeah, but...."
"But what?"
"I....I just wish Robin wasn't going to be with us. Boys always spoil everything!"
"That's not fair, Amber! Robin isn't like that! He's the best brother, I love him! This was all his idea, anyway, he saw an advert on the tube, and asked Mum and Dad if we could do it. He e-mailed and got all the information himself. He couldn't be left out, no way!"
Amber was thoroughly taken aback at her best friend's indignation, stammering an apology. "S....sorry, Cassie, I....I didn't mean to upset you. I....I know Robin's nice, h....he's not like some of the....other boys at school."
"Well, some of them are pretty horrible, but not my brother! He should be back soon, anyway. He's over at Charlie's, helping with their den - Charlie and his big brother are doing Den Day, too - Dad's going to pick Robin up on his way back from work. Then we can all get in our den, and start having fun!
****
"You're joking, right?" Charlie's tone was incredulous. "Amber Wicks is going to be in your den? All night?!"
"Yeah, she's Cassie's best friend. Cassie invited her, but no-one thought she'd be able to come over, her mum is mega-strict, Amber's never usually allowed to do anything. Our mum rang her mum, though, and persuaded her, somehow."
"Blimey, Rob, you're so lucky!"
Robin was genuinely nonplussed. "Lucky? Why?"
"Duh! Because Amber's the hottest girl in the whole school, even if she is only a Year 5! You've got to try and snog her, at least!"
"Yeah....I guess." Robin's vapid response seemingly eluded his friend completely. And even if Charlie had known the reason for Robin's lack of enthusiasm, he wouldn't have believed it. The truth was that, to Robin's eye, there was one girl at their school who was in a completely different league from Amber, and all the rest - his beautiful sister, with her shoulder length light brown hair, lovely hazel eyes and stunning smile, not to mention her friendly, loving personality. Robin adored Cassie, had done so for as long as he could remember, and she loved him back, too, he knew that. Why did she have to be my sister, the boy thought for the umpteenth time. If she wasn't, I'd ask her to go out with me in a second.
"She might even let you....do sexy stuff!"
"Now you're joking, Charlie! Amber'll never do anything like that, she'd be too scared of her mum finding out! And even if she would, Cassie's going to be there. I'm not going to do sex stuff in front of my sister, am I?!"
"Wait till Cassie's asleep! And anyway, if Amber gets to see that monster you've got hiding in your pants, she'll forget all about her mum!"
Robin blushed instantly, but grinned in boyish pride, too. He'd known for a while, from sights seen in swimming pool changing rooms, that his penis was quite a bit longer than most other boys of his age, and seen where that advantage had come from, too - his dad was a very well-endowed man. Charlie's knowledge of Robin's 'good fortune' had come about a couple of months earlier, at the end of the Easter holidays, when the two friends had had a sleepover at Robin's house. Charlie was keen to share the lessons that he'd learned from his 14 year old brother, Lucas, when they'd shared a bedroom at the cottage their family had rented for a week away earlier in the school break - Charlie had woken early one morning, catching Lucas at the climactic moment of the immemorial act beloved of virtually every pubescent boy. The brothers were almost as close as Robin and Cassie, so rather than being angry, Lucas had instead explained the process, before coaching his younger sibling through to the shivery intensity of his first ever dry orgasm. Charlie wasted little time in giving Robin a practical demonstration on that Friday night in Robin's bedroom, before encouraging his friend to follow his example. Try it, Rob, he'd said, it feels awesome. As soon as Robin had hesitantly lowered his pyjama bottoms, Charlie's eyes had stretched wide in disbelief. Yours is huge, he'd gasped, almost as big as Luc's! Later in the evening, after Robin had, indeed, discovered that Charlie was right about the 'awesomeness' - twice in half an hour, in fact! - a ruler had been located in a desk drawer, and a quantitative comparison of the two boys made. Charlie had come in at a respectable, for an 11 year old, eight centimetres, but was thoroughly eclipsed by his best friend. Twelve centimetres, Rob, Charlie had gushed, that's amazing! Between the memories of that sleepover, and thoughts of the two girls he'd be spending the night with, Robin felt the now familiar tingle and surge of tightness in his groin as his body tipped into the arousal it had been on the verge of for the previous few minutes. Charlie noticed the growing bulge in his friend's shorts, and smirked.
"Thinking about Amber already, eh?!" Robin grinned sheepishly, but said nothing. "Luc tried to get Mum to let his girlfriend come over tonight, but all he got was her schoolteacher voice, he said - 'I think you know the answer to that question already, don't you, Lucas?'! I'm glad Mum doesn't teach at our school, that would be so weird!"
Robin giggled, partly in amusement at his friend's pitch-perfect impression of his mother, but also somewhat in relief at the change of subject.
"Yeah - I like your mum, but I bet she'd be dead strict as a teacher!" Just at that moment, the boys heard a car horn sound in the street outside. Robin looked out, and saw his dad's car at the kerbside. "Gotta go, Charlie! Have a good night!"
"I bet I don't have as much fun as you will, you lucky git! Give Amber a snog for me, too!"
Robin grinned again and gave his friend's shoulder a playful shove before heading for the door. As he got out of the car, back at home, Robin looked up, to see Cassie at her bedroom window. The girl smiled sweetly, and gave him a little wave. Robin smiled back happily, but, as he went through the front door, the smile changed to a smug little smirk. Maybe something could happen tonight, he thought. A plan began to take shape in the boy's mind. Maybe, just maybe....
****
Cassie woke to the feeling, rather than the sound, of an almost voiceless whispering in her ear. It was late, nearly midnight by the little battery clock that normally sat on her brother's bedside cabinet, the girl having been asleep for a little more than an hour after a busy evening of food, fun and games. When the siblings had set their den up the evening before, they'd found it was too dark inside with all the drapes lowered once the daylight coming through the living room windows had faded, so their dad had retrieved Cassie's old nightlight, an item she hadn't used since she was 5, from the garage, its faint orange glow providing enough illumination to prevent the den's occupants from falling over each other if a visit to the toilet, or some other eventuality, became necessary.
"Look what Robin's doing!"
Cassie was one of those people who virtually never lingered in the shadowlands between sleep and wakefulness, usually fully alert within moments of her eyes opening. Even if that hadn't been customary for her, though, what she saw as she raised her head and looked over towards the opposite side of the den, where her brother had bedded down on a foam camping mattress, would have grabbed her attention in a heartbeat. Cassie gulped in a big breath, only barely managing to avoid calling out to Robin, such was her surprise. Instead, she turned her head, her lips almost touching Amber's ear.
"Wow, oh wow!" Cassie breathed.
"I know, right!" Amber replied, almost inaudibly. "I....I've never seen a boy's....you know what before!"
Cassie, for her part, had seen her brother, indeed her parents too, naked before, but it wasn't a common occurrence - the family weren't nudists, or even close, but they weren't fanatically prudish in the privacy of their own home, either - but what she hadn't seen was Robin as he was now, slowly stroking his full erection with a blissful look on his handsome face. The girl shivered involuntarily, feeling butterflies in her stomach and the beginnings of dampness between her own legs. She knew that meant she was starting to feel sexy, her mum had explained the response to her a few months earlier when Cassie had woken from an unremembered dream with soaked underwear, and had been so upset because she thought she'd wet the bed, like a baby.
"Ssshhh! Let's watch what he does!"
Robin had heard, straight away, the rustlings from the double air mattress the girls were sharing, and the faint sibilance of their whispering, even if he couldn't begin to make out what they were actually saying. Were they disgusted? Or were they interested? Was his plan working, or not? As the seconds passed, though, all speculations were driven from his mind by the tide of pleasure washing out from his groin. His breathing quickened and shallowed, and, all too soon, as ever, he knew he'd reached the point of no return. The boy clenched his teeth so hard, in his determination to stay quiet, that he thought his jaw might break, but even that effort couldn't suppress the little whimper that escaped him as the strongest orgasm he'd yet experienced shook his young body to the core. His penis pulsed drily at least a dozen times before the sensitivity became too much, and he had to let go, his pent breath escaping his lips in an audible rush. Robin instinctively rolled onto his side, his knees drawn up to his midriff, his back to the girls, and pulled his light blanket across his body. He was asleep within moments.
"What happened?" Amber asked her friend. "What was Robin doing?"
"I don't know," Cassie replied honestly. She knew she desperately wanted to find out, though.
****
Go to sleep, go to sleep, Cassie intoned in her head. Amber had been skittish for half an hour or more after Robin's 'show', but, at length, her breathing had evened out, and she'd descended into unconsciousness. Cassie allowed a few more minutes to pass, then blew gently into Amber's ear. Not a flutter. Now, then, Cassie thought. She slipped out of the far side of her bed, creeping silently, head bowed to avoid the top drapes of the den, until she found her way to her brother's side. She knelt down, laying her hand on the nape of the boy's neck. Robin stirred within seconds.
"Hi, Cass."
The girl kissed his cheek. "Hi, Robbie." The boy smiled gently. No-one, no-one at all, was allowed to call him Robbie. Except his sister. Any more than anyone other than Robin was allowed to call his sister Cass. It was the siblings' secret code of their love for each other. Cassie took Robin's hand, squeezing it gently.
"Robbie...." the girl began hesitantly. "W....what were you doing....before? I....it looked like....you were....really enjoying it. D....did it feel good?"
Robin's cheeks flushed a little, and he paused a moment before answering. He'd planned to let one or other of the girls catch him, as Lucas had been caught, but there was still an undercurrent of embarrassment that Cassie had seen him....playing, as he called it in his head.
"Y....yeah, it felt great, the best one I've had, I think. It was....exciting, kind of knowing you and Amber were watching."
"Do you do it lots, then?"
"I....I dunno - most days, I suppose. I haven't been doing it long, though, Charlie taught me how when we had that sleepover just before we went back to school after Easter."
There was a long silence, but there seemed to be some kind of unspoken communication between brother and sister. Cassie, barely, managed to speak first.
"C....can you....show me how it works, Robbie? Please?"
Robin felt like squadrons of butterflies were practising aerobatics in his stomach - and he knew, too, that he was as hard as he'd ever been in his life. The prospect of any sort of sexual play with his gorgeous, beloved sister was so exciting to the boy that he was almost hyperventilating.
Y....yeah - if....if you want." Cassie looked at him, a serious but expectant expression on her face. There was a last thought, in the back of Robin's mind, that maybe he shouldn't go through with it, that she was his sister, after all, but the near-pubescent hormones coursing through his body washed the final shreds of inhibition away, and he pulled his blanket aside. Cassie gasped.
"Robbie - it's s....so big! Do all boys'....penises get this big when they're feeling....sexy?"
"I....I don't think so, I think mine's....bigger than usual for my age. But Dad's got a big one, too, you know, don't you, you've seen him undressed. Maybe it runs in the family."
"I....it's....beautiful, Robbie!" Cassie lowered her eyes, and drew in a deep breath. "C....can I....touch it....please?"
The boy shuddered involuntarily. "Yeah....I....I'd love you to, Cass!"
Cassie reached out, her fingertips barely grazing the pale pink, swollen flesh. Robin squirmed. The girl's fingers curled gently around his shaft, just applying enough pressure to allow her to gauge the rigidity in her grasp. The boy moaned, much more loudly than he would have wanted. Cassie withdrew as if she'd been stung.
"S....sorry, Robbie! I hurt you, didn't I?"
"N....no, no way, Cass! It felt....awesome! Do it again!" The girl did as she'd been bidden, taking her brother in hand once more. "Oh Cass, that's so nice! Hold it near the top, where the skin joins, and rub up and down, slowly, though, please."
The girl didn't quite get the gist immediately, so Robin carefully guided her hand, and its movements, to maximise his pleasure. After a few seconds, he laid back, let go, and simply luxuriated in the feelings his sister was inducing in his raging body.
"Ooohhh, Cassie, that's perfect, just keep doing it like that!"
In little more than a minute, Robin's body shivered out of control.
"Faster, Cass, faster! Don't stop, please! I....I'm gonna....!"
His orgasm hit with unbelievable force, the delirious spasms surging, it seemed, from somewhere much deeper inside than anything he'd experienced before. The boy's hips thrust up instinctively into Cassie's coaxing hand, his penis bucking against her fingers. All too soon, the corporeal fireworks were over, Robin slumping back onto the foam pad beneath him, panting like he'd just been running for his life.
"Ooohhh Cass, that was soooo good! I love you!"
The girl smiled, but her confusion was obvious. "I....I love you, too, Robbie, b....but I still d....don't understand w....what happened to you."
The boy reached up and drew Cassie gently down towards him, kissing her softly on the lips, before turning on his side and encouraging her to lie close beside him, almost nose to nose.
"I....I don't know that much about it, either, Cass, only what Charlie told me. He did tell me the proper name for it, for the feelings, I mean, but I can't remember it - or....or-something - but he said Lucas told him most people call it 'cumming', spelt with a 'u', not an 'o'. He said it's when the sperms come out when you have sex, but Charlie and I aren't old enough to make sperms yet, it doesn't usually start until you're 12 or 13, Lucas said. Charlie said he saw Lucas squirt his sperms out, though, so that means Lucas could get a girl pregnant, if she'd started her....periods."
"Mum told me about periods," Cassie said, almost to herself. "She told me as well that girls get wet in their....pussy when they're feeling sexy, like boys get....hard. Can girls do....cumming, too?"
"I don't know," Robin admitted. "Girls don't make sperms, though, they have eggs instead that the sperm joins with to make babies when they're older, we learned about that at school. Does it feel good, like kind of tingly-tickly, if you touch yourself? That's what it feels like when I touch my....dick, and then when I rub it, it keeps getting better and better until I get the cumming feelings, so if you feel like that, you should get the feelings, too".
" Y....yeah, Robbie, it does sort-of feel like that. A....and I'm really ....wet....down there at the moment."
Robin looked into his sister's eyes for long seconds, the butterflies taking wing once more. "S....shall we try, Cass? C....can I touch you, try and make you feel as good as you made me feel? Please?"
Cassie gently pressed her lips to Robin's once more. "I....I'd really like that, Robbie," she breathed.
"I....I've never touched a girl before - c....can you show me the best way to....do it, so I don't hurt you, and so it feels nice for you?"
Cassie nodded, mutely, a flush of desire painting her beautiful face. Robin gently nudged her onto her back before moving to kneel beside her, his eyes unwaveringly on the girl's. As though those eyes had asked her aloud, Cassie shifted her hips and quickly lowered her pyjama bottoms and panties, Robin helping her to slide them over her ankles and off. The boy's gaze shifted, as though drawn by a magnet, to the thin, hairless slit between his sister's legs, faintly glistening with moisture in the dim light. The sight caused his penis to throb back, almost instantaneously, to full erection.
"Oh, wow! You....you're beautiful, too, Cass!" Robin extended his arm, his hand moulding itself to the silky softness of Cassie's pubis, his forefinger finding the narrow valley of her vulva. He began to rub softly, slowly, rhythmically, the digit slipping easily up and down, aided by the natural lubricant trickling from within the girl's body. Cassie sighed in pleasure.
"Oh, Robbie, that feels lovely, much better than when I touch myself! Stop, just for a second, though, I want to show you something." Robin, reluctantly, lifted his hand from his sister's body. Cassie's left hand reached down and parted her outer lips, the boy gasping as the never before seen inner anatomy came into view. Cassie used her other hand to point to a small bump near the top of her slit. "Look, Robbie, see that place?" The boy nodded, eagerly. "That's where it's most sensitive. It feels really tingly if you touch it. Be really gentle with it, though, please."
The boy nodded, before quickly leaning down to kiss the girl once more.
"Course, Cass," he whispered, almost into her mouth. "Just tell me if I do it wrong."
The siblings adjusted their positions once more, Cassie parting her thighs wider, and Robin kneeling between them. The boy used the fingers of his left hand to part the outer lips, as he'd been shown, then, as carefully as he could, brought one fingertip to the girl's 'sensitive place'. He tickled it lightly, and Cassie shivered.
"Ooohhh yes, Robbie, feels so good! Keep doing it, just like that!"
Robin continued his gentle caresses, and now that he was confident he was touching his sister in the best place for her, he moved his left hand lower, to explore further. He felt the wetness increase, and within moments, had found its source. That must be her....pussy hole, the vagina, as they'd called it in the lesson at school, he thought, where my dick would go if....if we had....real sex. His penis lurched at the idea, the boy felt as though he was close to cumming again, and without even touching himself. As carefully as he was touching his sister's 'pleasure bump', he began to probe at the inner lips with another finger. Just at that moment, Cassie's rising excitement caused her hips to lift, and Robin's finger sank at least a couple of centimetres into the tunnel of flesh. Cassie groaned.
"Ooohhh Robbie, oh yeah, do it more! Do it deeper!"
Cassie was an active girl, far more athletically inclined than Robin himself, taking part in gymnastics and riding her bike regularly, and, as a result, her hymen had been broken at some indeterminate time in the past, meaning that there was no resistance at all to Robin's finger as it slid all the way into her buttery depths. The girl began to tremble, uncontrollably.
"Something's happening, Robbie, don't stop! I'm getting....the feelings....r....right now!"
Cassie whimpered, and the boy felt the muscles around his finger begin to contract, over and over. She's cumming, he knew instinctively, the realisation touching off another climax in the boy's own body, as though it was his penis buried in her grasping sheath. After long seconds of mind-melting pleasure for both siblings, Cassie slumped back to the mattress, pulling Robin down on top of her. They hugged each other as closely as at any time in their lives. Robin's still throbbing penis slid against Cassie's wetness, causing them both to groan aloud.
"Put it....inside, Robbie. I....I really want to!"
"A...are you sure, Cass?" The boy could hardly believe his ears.
"Really, really, sure! Your finger felt amazing in there, y....your....dick will feel ten times better, I know it! And we can't accidentally make a baby, because you haven't got any sperms yet, and I haven't started my periods. Please, Robbie, let's do sex together!"
"B....but it's bigger than my finger, Cass. I....I don't want to hurt you. I....love you, more than anyone!"
"It's longer than your finger, but not much fatter," the girl countered. "Let's try, Robbie, please. If it hurts, I'll tell you, I promise, and we can stop. Kneel up for a second."
Robin did as she'd asked, and Cassie slid lower, raised her knees and splayed her thighs as wide as she comfortably could, placing herself, although she couldn't have known it, in the classic 'missionary position'. Then she reached out, taking her brother's erection tenderly between her fingers, guiding him to her threshold.
"Push in, darling Robbie, gently, though, slowly as you can."
Robin felt the wetness against the tip of his glans and groaned in his excitement. He edged his hips forward a few millimetres, but seemed to make no progress. Cassie caught her breath. The boy stopped.
"It won't go, Cass," he breathed.
"It will, Robbie. Push a little bit harder."
Robin tried again, and, at the same moment, Cassie rose up a little to meet him. As it had been when the boy had first penetrated her with his finger, there was an almost instantaneous movement of a few centimetres, from outside to in. Cassie grunted, impossible for her brother to know whether the sound was born of pain or pleasure.
"Are you OK, Cass?" he asked urgently.
"Y....yeah, feels good. Feels big, though."
"Shall I take it out?"
"N....no, just give me a second to get used to it."
Robin looked once more into his sister's eyes, and while being careful to keep his hips still, touched his lips to hers. This time, both boy and girl instinctively opened their mouths a little, the tips of their tongues coming together, each tasting the other for the first time. Cassie broke the kiss, looking up adoringly at her brother.
"Now, Robbie, put it all inside me now!"
Robin began easing forward once more, shaking, it felt to him, from head to foot. The warmth, the slick lubricity, the tightness he felt engulfing his boyhood was simply overwhelming. By the time he felt the skin of his hairless pubic mound touch his sister's, the gentle kiss of their flesh signalling, unequivocally, the loss of their virginities, he was close to tears, as much from the emotional overload as from the exquisite physical sensations.
"Oh, Cassie, oh, I....it....it's so, so good! I....I never knew....anything could feel so....wonderful! Does it feel good to you, too, Cass? I w....want it to feel as g....good for you as it does for me, really."
"I....it's amazing, Robbie, just amazing! I feel so full, but it's so brilliant! Go in and out, that's what we're supposed to do, isn't it?"
"Y....yeah, I....I think so. I'll try."
Robin drew back slightly, before once more sinking slowly, fully into his sister's clinging depths, causing them both to sigh at the delicious feelings. Naturally, Robin's inexperience meant that he took a little time to find a smooth rhythm, although he did have the advantage that his long penis meant that the risk of him slipping out of his sister was close to zero. After a couple of dozen thrusts, though, the boy had begun to find the optimum length and speed of stroke, his increasing confidence translating directly into increasing pleasure for both siblings.
"Ooohhh Robbie, so good! You're rubbing against something really nice inside me, it feels fantastic!"
"Cass, it's so fantastic for me, too. I can't believe it, I'm so lucky! I'm h....having....sex w....with the most beautiful girl in the world! I love you so much!"
"I love you too, I can't believe there's a better brother anywhere! Go faster, Robbie, I....I'm going to get the....cumming feelings again, really soon!"
Cassie lifted her legs higher, wrapping herself around Robin's slender hips, seemingly wanting to draw him even deeper into her heaving body. The boy increased the pace and intensity of his thrusting, to the point that a faint clapping sound could be heard in the den as the siblings' bodies came together, again and again. Cassie's breathing quickened rapidly, turning to almost sobbing pants as her excitement reached boiling point. Suddenly, Robin felt a gush of extra wetness around his throbbing erection, then a series of pulsing squeezes as his sister hit her peak.
"Ooohhh yessss! Don't stop, Robbie, please don't stop!"
Robin had no intention of stopping, his own release, he knew, was only seconds away. Twenty, ten, five more jackrabbit thrusts, before the ecstasy hit him like a runaway train, his whole body feeling like it was on fire, his penis seeming as though it might burst at any second before erupting into a series of huge dry spasms, stronger by far than anything he could have imagined. Time had stopped, all that existed for the boy was the searing pleasure exploding through his genitals. His body was on autopilot, his hips somehow continuing to pump without any hint of conscious control. Somewhere, far in the distance, he was dimly aware of Cassie whimpering, then felt the girl's muscles tighten against him once more as she reached a second climax, wringing even more delight from his nearly exhausted body. Then, like a curtain falling, it was all over. Robin's movements stuttered, once, twice, then came to a halt. He had just enough strength left to avoid outrightly collapsing onto his sister's body, easing his light frame down until they were touching almost from head to toe. After long moments of panting breaths from both girl and boy, their lips found each other once more, and they kissed, gently, tenderly. There were no words, both instinctively knew none were necessary. Neither had any doubt, despite their youth, that they had just shared one of the cardinal moments of their lives. Robin's penis slowly softened, and, eventually, slipped from his sister's liquid embrace. Cassie sighed.
"W....we can do that again, soon, can't we, Robbie?" she murmured.
"I....if you want to, Cass, course we can. We'll have to be....careful, though, if anyone finds out....I....I don't know what....would happen."
Cassie nodded unhesitatingly, realising her brother was right. What the siblings had forgotten, though, first in the excitement of their voyage of mutual discovery, and then in the contented afterglow of their lovemaking, was that they weren't alone.
Amber laid awake, her heart pounding in her chest, her mind in turmoil. She'd woken some half an hour earlier, immediately aware that Cassie wasn't lying beside her. After blinking several times as her vision adapted to the low light, she saw her friend kneeling beside Robin's bed. Just then, the boy peeled his blanket away in response to something his sister had said. Amber gasped as Robin's lower body came into view once more, her focus on the long, thin stalk of flesh jutting from between his legs. Her eyes went wide with disbelief as Cassie reached out and....touched it! If that first touch had shocked Amber, what followed as the minutes progressed was completely beyond the girl's comprehension. Cassie had stroked Robin as the boy had done to himself earlier, with, apparently, the same result, they'd then changed places, Robin using his fingers gently to Cassie's obvious delight. Amber squinted to see what the boy was doing to give her best friend such pleasure, just in time to see Robin's forefinger disappear inside Cassie's body. The effect on Cassie was electrifying, she shook, moaned, whimpered, but obviously not due to any sort of pain. Amber's hand, almost unconsciously, slipped beneath the thin material of her underwear, touching what, for her, was almost unknown territory, trying to understand what her best friend was feeling. Robin and Cassie had moved again, laying close together, wrapped in each others' arms. In the absolute silence of the den, some of the siblings' low whispers were loud enough for Amber to overhear, but what she heard next, she simply couldn't believe. 'Put it inside', that couldn't be what Cassie had said. Could it? That would mean....they were going to....have sex? Amber wrenched her hand away from her body. They can't! It....it's wrong, it's....dirty! Amber, just once, a year earlier, had asked her mother, after watching a TV programme about young animals, how people had babies. The look of distaste on her mother's face had been so pronounced that even a nine year old couldn't possibly mistake it. You don't need to know about dirty things like that, the woman had said sternly, almost angrily, that's for when you're grown up, and married. Robin and Cassie weren't grown up, though, and they couldn't get married even if they were, brothers and sisters weren't allowed to, Amber knew that. Didn't they know it was wrong? Amber wanted to stop them, somehow. Should she just tell them not to do it? Should she go and tell Mr and Mrs Beaumont what was happening? Amber was frozen in place, though, unable to drag her eyes away from the unfolding drama little more than a metre away. Robin was now kneeling between his sister's legs, Cassie was guiding his....boything, closer, closer, touching, a momentary hiatus and an exchange of whispers, then - Cassie made a noise that sounded to Amber like her friend had been punched in the stomach, as the top part of Robin's spike disappeared inside his sister's body. Another pause, more words, below the threshold of audibility this time, and then Robin moved forward again. Amber forgot to breathe as the boy's whole length was slowly swallowed by Cassie's insides, until their....private bits were touching together. Then they started moving, well, mostly Robin moving, although Cassie put her legs up and gripped around his....bum after a minute or so, like she wanted the boy to be even deeper inside her. They both looked as though they were in heaven, Amber thought, and, once more, her hand found its way inside her panties, her finger creeping into the deep cleft of her vulva, as she'd seen Robin do with Cassie, just minutes earlier. Amber felt dampness that she knew wasn't wee, even if she didn't know what it actually was, and, as she pressed a little more firmly, caught her breath as a spark of pleasure emanated from somewhere beneath. She moved her finger, experienced another jolt of good feelings, homed in instinctively on the source, a firm feeling lump near the top of her slit, began to slide her fingertip across and around it carefully. She could feel herself becoming wetter, and moved her other hand to investigate. She prodded, hesitantly, at herself for a second or two, then had to almost bite her tongue to avoid crying out as the finger found the opening, and slipped inside to the first joint. That's it, she knew at once, that's where Robin's thing had gone into Cassie! Before she could process her discovery, though, her attention was dragged back to the siblings, as their movements and panting breaths seemed to signal a crucial moment. 'Oh yes, don't stop', Amber heard her friend gasp, while Robin's hips pumped so fast that the girl thought he must be hurting himself, or Cassie, or both of them. But then the frenzy was over, Robin stopped moving and laid carefully down on top of Cassie, they kissed, several times, before finally moving a little apart and sharing another inaudible conversation. Amber caught a glimpse of Robin's 'boything', now seemingly soft and floppy, but visibly wet, from the moisture of Cassie's insides, she realised. Brother and sister languidly retrieved their discarded nightclothes, and dressed slowly, before cuddling together on Robin's bed, the boy behind his sister, their bodies moulded together. It took no time at all until both were asleep. The same couldn't be said for Amber. She simply couldn't equate the 'dirtiness' her mother had referred to with what she'd been observing. Cassie and Robin's pleasure, closeness and love for each other were plain to see - and totally beautiful, not dirty at all. Amber yearned for someone to kiss her like the siblings had kissed each other, to touch her like they had touched. When she did eventually fall into a fitful sleep, it was with tears in her eyes.
****
"You'd better get back into your own bed, Cass," Robin murmured sleepily. "We don't want Mum and Dad finding us like this."
"Do I have to, Robbie?" Cassie asked with obvious disappointment. "Can't we just say I had a bad dream, or something, and that you were looking after me?"
It was 6:00, and the early light of a bright Spring morning was already seeping into the den, even through the heavy material of which it was constructed. "Amber's here, too, don't forget."
"I suppose so," Cassie replied with resignation in her voice. "It's really nice, you cuddling up to me like this, though."
"I know, it's really good for me, too. W....what we....did last night was too fantastic for words, though, a....and I want to do it....lots more, a....as long as you....want to, as well. But if we get....caught...." The boy's voice tailed off, but the message he was trying to convey was crystal clear.
Cassie rolled to face her brother, unhesitatingly planting a melting kiss on his thin lips. "Me, too, Robbie, I want to do it whenever we can. It was the....best thing, ever, ever!"
"I love you, Cass."
"I love you, t...."
"I saw you." The siblings jumped almost out of their skins, the blood draining from their faces. "I watched you....doing it!"
Robin and Cassie moved to cling to each other as if they'd just heard a death sentence. Amber continued, her voice seemingly emotionless, all the more chilling for its neutrality. "Why did you do it? Children aren't supposed to, it's only for grown-ups. My mum said so." Neither sibling could find so much as a word, still less a coherent answer. Amber focused her attention on her best friend, her icy carapace dissolving by the second. "D....did you like it, Cassie? Did it feel good?" Cassie nodded, mutely. "And Robin didn't hurt you?"
"N....no, Amber, really! It felt....weird, just for a second, sort of....too full, when he first put his....dick inside me, but it didn't....hurt, I promise! And then it started feeling really, really nice, really quickly."
"Are you....going to tell on us?" Robin asked, nervously.
Amber looked at the boy blankly, as though the question had been asked in some incomprehensible language. Cassie picked up on her friend's hesitant confusion.
"Please don't tell, Amber! I don't want Robbie....Robin to get in trouble, I love him, loads!"
"I....I don't know....w....what to do...." Amber began, but her overwrought emotions caught up with her, and she started to cry. Cassie instantly disentangled herself from Robin, scooted across to her friend's side, and wrapped her up in a close hug.
"Don't cry, Amber, please don't!"
"S....sorry, Cassie," Amber managed after a few moments. "I....it's just that....I don't....understand. Mummy says....it's dirty, b....but you a....and Robin....well, it didn't look....dirty at all. I....it looked....lovely."
"It was lovely, Amber. Robin made me feel better than I've ever felt in my whole life." Cassie paused. "H....have you....ever touched yourself....down there?"
Amber flushed with embarrassment. "No! Well, n....not really. M....maybe a....little bit, when I was....watching y....you and Robin....doing it."
"Did you like it?"
"I....I don't know - I....I suppose so. I got....all wet. D....does that happen....to you, too?"
Cassie smiled. "Yeah! That's what supposed to happen when you're feeling....sexy. Mum told me about it. Like Robin's....dick gets....hard. Boys get hard, and girls get....wet. I....it's so the boy....can go....inside the girl more easily."
"Did your mum tell you that?"
"No, but I....kind of worked it out, earlier on. When Robin first put....his finger in me, it slid right down inside, really easily, and didn't hurt at all. It wouldn't have been like that if I hadn't been....slippery, I bet!"
"And it really felt....nice, having....something....inside you, like that?"
"Honestly, it felt great!" Cassie looked into her friend's eyes. "Y....you should....try it, Amber. Then you'd find out for yourself!"
Amber's head felt like it was about to explode. The diametric opposites, her mother's utter disapproval against Cassie's enthusiastic advocacy, were too much for her to come to terms with. Not knowing, at all, what to say, she said nothing. She felt Cassie snuggling closer to her, sensed her friend's warm breath beside her ear.
"Do you want to, Amber - try, I mean? I'll show you what to do, if you want."
Once more, Amber couldn't find any kind of reply. Cassie decided that her friend's lack of a rebuttal was close enough to assent, and gently slipped her hand between Amber's legs, outside her nightclothes, cupping her pubis. There was a momentary, instinctive closing of Amber's legs, but all that was achieved was to increase the pressure of Cassie's touch, sending a warm wave of pleasure through Amber's lower body. The girl moaned softly.
"Nice?" Cassie whispered.
"Mmmm, I like that."
"Shall I carry on?" Amber nodded slightly, and Cassie began to move her hand slowly, massaging the sensitive area carefully. Amber, after a few seconds, began unconsciously pushing herself up into Cassie's palm. Her eyes closed, while her lips parted a little as the new and exciting feelings began to build.
"Let's get....undressed, Amber," Cassie whispered, "it feels better....naked."
Once more, Amber didn't demur, so Cassie gripped the waistband of her friend's pyjamas, and began to ease them over the girl's hips. Amber neither resisted nor assisted, but, within seconds, only her underwear was covering her girlhood. Cassie touched the front of Amber's panties gently.
"Gosh, you are wet! Shall we take these off, too?"
Amber's underwear quickly went the way of her pyjamas, followed by the T-shirt she was wearing. Cassie and, behind her, Robin, both gasped.
"Wow, Amber!" Cassie exclaimed. "Your....boobs are....so nice!"
Cassie was more or less completely flat-chested, but her friend had undoubtedly begun the voyage into puberty - her nipples were probably twice as big as Cassie's, atop breast buds each the size and shape of half an egg. Robin, in particular, was totally fascinated by Amber's form and shape, his penis responding accordingly, completely rigid in moments.
"A....Amber?" the boy breathed. "Can I touch your tits....I....I mean your....breasts, please? They really look...awesome!"
Amber looked almost panic-stricken, impelling Robin to try and reassure her. "I'll be ever so careful, I promise."
"O....OK," Amber replied, before drawing in a huge breath as Cassie's fingers gently touched her naked flesh for the first time. Robin crossed the den to Amber's left hand side, then tentatively reached out, allowing his fingertips to brush lightly against Amber's nipples, first the left, then the right.
"Ooohhh, Robin! Do that again, that's sooo nice!"
The boy shifted his position a little, kneeling close to Amber so that he could use both hands on her body. He ran the balls of his thumbs across the sensitive nubs, delighted to see and feel them growing and stiffening at his touch. Meanwhile, his sister had begun to dip a finger between Amber's labia, slipping easily through the girl's increasing wetness. Amber instinctively spread her legs wider as her pleasure leapt to previously unimagined heights, her eyes closed and her head beginning to loll left, then right, as the siblings continued their gentle ministrations. Much as Cassie had earlier, in response to her brother's stimulation, Amber's hips lifted, causing her friend's fingertip to penetrate the inner lips, and slip a centimetre or so into her sopping vagina. Amber groaned at the new sensation, thrusting up deliberately to impale herself on Cassie's probing finger.
"Ooohhh yessss! Oh, Cassie, that feels wonderful! More, please, more!" The girl was getting a little over volume, Cassie shushing her urgently, lest her parents should hear. With all the willpower she possessed. Amber forced herself to remain silent as the combined delights of three hands on and inside her body tipped her over the edge of her first ever orgasm, her hips jerking spasmodically as Cassie continued to slide her finger rapidly in and out of her grasping tunnel of flesh. Then it was all over, Amber's body suddenly seeming to lose all its strength as she flopped back heavily onto the mattress, her breath coming in huge gasps.
"Ooohhh, wow!" Amber exclaimed after long seconds. "Wow, wow, wow! That was....was....unbelievable! Did it feel that good when you and Robin were....doing it, Cassie?"
Cassie nodded, wordlessly. Amber turned her head to look at the boy, her gaze falling greedily on the, to her, massive bulge in Robin's pyjama trousers, before looking into the boy's eyes.
"I....I want to try it, t....too. C....can we, Robin....please, please?"
Brother and sister looked at each other, amazed at the sudden change in Amber's demeanour, from the demure, innocent girl they'd known for years, to this....hunger, there was no other word for it.
"W....would you m....mind if we....did, Cass?" The boy felt like he'd almost forgotten how to speak, such was his excitement.
Cassie's emotions were almost painfully mixed. She wanted her brother to give and get the same pleasure with Amber as they'd shared just a few short hours before, wanted her friend to experience the delights of the ultimate act of intimacy, but she couldn't help but feel that Robin should be hers, and hers alone. Seconds passed. Amber broke the tableau.
"Please, Cassie! I know you and Robin....really love each other, but I....want to try, so much. Please can we? Just this once?"
Even as Cassie's mouth opened, she seemed hardly to know which words would emerge. "O....OK, then, as long as Robin....doesn't mind, I d....don't."
Robin smiled straight into his sister's eyes, before leaning across and kissing her lips gently, lovingly. He moved his face close to Cassie's ear, whispering almost inaudibly.
"I....it'll be different, Cass, I know. I don't....love Amber, b....but I really, really love you, and I always will, I promise. Thank you for letting me....try with Amber." The siblings kissed again, before Robin quickly shucked his nightclothes and turned his attention to the girl at the centre of the bed. Amber reached out and took the boy's erection carefully in her hand, exploring its shape and texture.
"I....it feels....so hard, Robin. Will it hurt when you...put it in....inside."
"I....I'll be as careful as I can, Amber, promise. D....do you want....to do it now?"
"Oh yes, yes please!" The youngsters arranged themselves as the siblings had earlier, Robin guiding Amber's hips lower and wider, kneeling between them. This time, it was his hand that moved his own penis to touch Amber's wetness.
"Ready?" The girl nodded, and Robin slowly, slowly, moved his hips forward, feeling the slickness and heat of a girl's body begin to envelope him for the second time in his life. Amber whimpered, just once, as a small sting of discomfort shot through her lower body, but it passed in a handful of heartbeats as the boy continued to carefully penetrate her depths, until there was no further to go. Their eyes met.
"OK, Amber?"
"Y....yeah. It feels....oh, it feels great!"
"I'm going to start....doing it. If you want me to stop, or do it....differently, just tell me, OK"
The girl smiled. "OK, Robin!"
The boy's thighs drew back, then thrust forward firmly, finding a smooth, slowish rhythm almost immediately.
"Uh....uh....uh," the girl grunted in time with Robin's movements. "Uh....y....yeah....just....like....that, i...it....feels....fantastic!" Within a couple of minutes, the girl began to pant heavily. "T....the....feelings....you're....going....to....give me....the....feelings!" Robin increased his pace markedly, and Amber crashed into climax, burying her face in Robin's shoulder to prevent herself crying out as the pangs of ecstasy coursed through her young body. Neither boy nor girl knew about multiple orgasms, needless to say, but Amber experienced just that, a second peak, almost as intense as the first, rippling through her just as she felt Robin's hardness begin to pulse wildly inside her as he went over the edge himself, the boy groaning aloud at the glorious sensations. Movements slowed to a stop, and Robin withdrew, breathless.
"Th....thank you, Robin, that was....so good. And thank you, Cassie, for sharing Robin with me. You're the best friend I could possibly have!"
Cassie smiled, genuinely happily. She really liked Amber, she loved Robin more than ever, and watching her best friend and brother together had been unexpectedly exciting, too. Cassie looked at Robin, grinning wickedly.
"Reckon you can do it again?" The boy's penis had begun to wilt, but quickly reversed direction at his sister's words. He nodded enthusiastically. "Good, because I want my turn!"
Two hours later, Mr and Mrs Beaumont walked into the living room, the woman lifting a corner of the drapes to take a surreptitious peek into the den. All three youngsters were in their respective beds, sleeping like babies. Mrs Beaumont smiled knowingly at her husband.
"Up half the night talking, I bet! Shall we give them another hour before I start sorting their breakfast out?"
"Don't see why not," the man replied. "It'll be nice for us to be able to have our breakfast in peace, for once!"
****
Charlie made a beeline for Robin as they made their way into school on Monday morning.
"Get to snog Amber the other night?"
Robin smiled crookedly, blushing a little. "Nah," he replied, truthfully.
"Wuss!" Charlie smirked. "I learned something new from Luc. It was great! I'll show you next time we have a sleepover! What about at mine this weekend?"
"I'll ask Mum and Dad!" Robin grinned. I bet you didn't learn as much as me, though, he thought smugly.
****
Love & best wishes to all
Sammy B
****
This might be the first in a series of adventures for Cassie, Robin and their friends - I like the siblings a lot! As ever with my literary endeavours, no promises, though!
SB
****
"I can't believe your mum and dad let us do this! It'll be brilliant!"
"And I can't believe your mum let you do it with us! We've asked her loads of times if we can have a sleepover together, but she's always said no."
"I think it's because your mum rang her, and said it was for charity, and we wouldn't be outside, or anything. It's such a great den, too! Did you make it?"
"Robin and I did it together, and Dad helped us, too, moving the furniture and that kind of stuff. Mum sorted all the bedding out, and found those old curtains in the airing cupboard for the roof of the den. She's got us loads of snacks and things as well. This is going to be great!"
"Well....yeah, but...."
"But what?"
"I....I just wish Robin wasn't going to be with us. Boys always spoil everything!"
"That's not fair, Amber! Robin isn't like that! He's the best brother, I love him! This was all his idea, anyway, he saw an advert on the tube, and asked Mum and Dad if we could do it. He e-mailed and got all the information himself. He couldn't be left out, no way!"
Amber was thoroughly taken aback at her best friend's indignation, stammering an apology. "S....sorry, Cassie, I....I didn't mean to upset you. I....I know Robin's nice, h....he's not like some of the....other boys at school."
"Well, some of them are pretty horrible, but not my brother! He should be back soon, anyway. He's over at Charlie's, helping with their den - Charlie and his big brother are doing Den Day, too - Dad's going to pick Robin up on his way back from work. Then we can all get in our den, and start having fun!
****
"You're joking, right?" Charlie's tone was incredulous. "Amber Wicks is going to be in your den? All night?!"
"Yeah, she's Cassie's best friend. Cassie invited her, but no-one thought she'd be able to come over, her mum is mega-strict, Amber's never usually allowed to do anything. Our mum rang her mum, though, and persuaded her, somehow."
"Blimey, Rob, you're so lucky!"
Robin was genuinely nonplussed. "Lucky? Why?"
"Duh! Because Amber's the hottest girl in the whole school, even if she is only a Year 5! You've got to try and snog her, at least!"
"Yeah....I guess." Robin's vapid response seemingly eluded his friend completely. And even if Charlie had known the reason for Robin's lack of enthusiasm, he wouldn't have believed it. The truth was that, to Robin's eye, there was one girl at their school who was in a completely different league from Amber, and all the rest - his beautiful sister, with her shoulder length light brown hair, lovely hazel eyes and stunning smile, not to mention her friendly, loving personality. Robin adored Cassie, had done so for as long as he could remember, and she loved him back, too, he knew that. Why did she have to be my sister, the boy thought for the umpteenth time. If she wasn't, I'd ask her to go out with me in a second.
"She might even let you....do sexy stuff!"
"Now you're joking, Charlie! Amber'll never do anything like that, she'd be too scared of her mum finding out! And even if she would, Cassie's going to be there. I'm not going to do sex stuff in front of my sister, am I?!"
"Wait till Cassie's asleep! And anyway, if Amber gets to see that monster you've got hiding in your pants, she'll forget all about her mum!"
Robin blushed instantly, but grinned in boyish pride, too. He'd known for a while, from sights seen in swimming pool changing rooms, that his penis was quite a bit longer than most other boys of his age, and seen where that advantage had come from, too - his dad was a very well-endowed man. Charlie's knowledge of Robin's 'good fortune' had come about a couple of months earlier, at the end of the Easter holidays, when the two friends had had a sleepover at Robin's house. Charlie was keen to share the lessons that he'd learned from his 14 year old brother, Lucas, when they'd shared a bedroom at the cottage their family had rented for a week away earlier in the school break - Charlie had woken early one morning, catching Lucas at the climactic moment of the immemorial act beloved of virtually every pubescent boy. The brothers were almost as close as Robin and Cassie, so rather than being angry, Lucas had instead explained the process, before coaching his younger sibling through to the shivery intensity of his first ever dry orgasm. Charlie wasted little time in giving Robin a practical demonstration on that Friday night in Robin's bedroom, before encouraging his friend to follow his example. Try it, Rob, he'd said, it feels awesome. As soon as Robin had hesitantly lowered his pyjama bottoms, Charlie's eyes had stretched wide in disbelief. Yours is huge, he'd gasped, almost as big as Luc's! Later in the evening, after Robin had, indeed, discovered that Charlie was right about the 'awesomeness' - twice in half an hour, in fact! - a ruler had been located in a desk drawer, and a quantitative comparison of the two boys made. Charlie had come in at a respectable, for an 11 year old, eight centimetres, but was thoroughly eclipsed by his best friend. Twelve centimetres, Rob, Charlie had gushed, that's amazing! Between the memories of that sleepover, and thoughts of the two girls he'd be spending the night with, Robin felt the now familiar tingle and surge of tightness in his groin as his body tipped into the arousal it had been on the verge of for the previous few minutes. Charlie noticed the growing bulge in his friend's shorts, and smirked.
"Thinking about Amber already, eh?!" Robin grinned sheepishly, but said nothing. "Luc tried to get Mum to let his girlfriend come over tonight, but all he got was her schoolteacher voice, he said - 'I think you know the answer to that question already, don't you, Lucas?'! I'm glad Mum doesn't teach at our school, that would be so weird!"
Robin giggled, partly in amusement at his friend's pitch-perfect impression of his mother, but also somewhat in relief at the change of subject.
"Yeah - I like your mum, but I bet she'd be dead strict as a teacher!" Just at that moment, the boys heard a car horn sound in the street outside. Robin looked out, and saw his dad's car at the kerbside. "Gotta go, Charlie! Have a good night!"
"I bet I don't have as much fun as you will, you lucky git! Give Amber a snog for me, too!"
Robin grinned again and gave his friend's shoulder a playful shove before heading for the door. As he got out of the car, back at home, Robin looked up, to see Cassie at her bedroom window. The girl smiled sweetly, and gave him a little wave. Robin smiled back happily, but, as he went through the front door, the smile changed to a smug little smirk. Maybe something could happen tonight, he thought. A plan began to take shape in the boy's mind. Maybe, just maybe....
****
Cassie woke to the feeling, rather than the sound, of an almost voiceless whispering in her ear. It was late, nearly midnight by the little battery clock that normally sat on her brother's bedside cabinet, the girl having been asleep for a little more than an hour after a busy evening of food, fun and games. When the siblings had set their den up the evening before, they'd found it was too dark inside with all the drapes lowered once the daylight coming through the living room windows had faded, so their dad had retrieved Cassie's old nightlight, an item she hadn't used since she was 5, from the garage, its faint orange glow providing enough illumination to prevent the den's occupants from falling over each other if a visit to the toilet, or some other eventuality, became necessary.
"Look what Robin's doing!"
Cassie was one of those people who virtually never lingered in the shadowlands between sleep and wakefulness, usually fully alert within moments of her eyes opening. Even if that hadn't been customary for her, though, what she saw as she raised her head and looked over towards the opposite side of the den, where her brother had bedded down on a foam camping mattress, would have grabbed her attention in a heartbeat. Cassie gulped in a big breath, only barely managing to avoid calling out to Robin, such was her surprise. Instead, she turned her head, her lips almost touching Amber's ear.
"Wow, oh wow!" Cassie breathed.
"I know, right!" Amber replied, almost inaudibly. "I....I've never seen a boy's....you know what before!"
Cassie, for her part, had seen her brother, indeed her parents too, naked before, but it wasn't a common occurrence - the family weren't nudists, or even close, but they weren't fanatically prudish in the privacy of their own home, either - but what she hadn't seen was Robin as he was now, slowly stroking his full erection with a blissful look on his handsome face. The girl shivered involuntarily, feeling butterflies in her stomach and the beginnings of dampness between her own legs. She knew that meant she was starting to feel sexy, her mum had explained the response to her a few months earlier when Cassie had woken from an unremembered dream with soaked underwear, and had been so upset because she thought she'd wet the bed, like a baby.
"Ssshhh! Let's watch what he does!"
Robin had heard, straight away, the rustlings from the double air mattress the girls were sharing, and the faint sibilance of their whispering, even if he couldn't begin to make out what they were actually saying. Were they disgusted? Or were they interested? Was his plan working, or not? As the seconds passed, though, all speculations were driven from his mind by the tide of pleasure washing out from his groin. His breathing quickened and shallowed, and, all too soon, as ever, he knew he'd reached the point of no return. The boy clenched his teeth so hard, in his determination to stay quiet, that he thought his jaw might break, but even that effort couldn't suppress the little whimper that escaped him as the strongest orgasm he'd yet experienced shook his young body to the core. His penis pulsed drily at least a dozen times before the sensitivity became too much, and he had to let go, his pent breath escaping his lips in an audible rush. Robin instinctively rolled onto his side, his knees drawn up to his midriff, his back to the girls, and pulled his light blanket across his body. He was asleep within moments.
"What happened?" Amber asked her friend. "What was Robin doing?"
"I don't know," Cassie replied honestly. She knew she desperately wanted to find out, though.
****
Go to sleep, go to sleep, Cassie intoned in her head. Amber had been skittish for half an hour or more after Robin's 'show', but, at length, her breathing had evened out, and she'd descended into unconsciousness. Cassie allowed a few more minutes to pass, then blew gently into Amber's ear. Not a flutter. Now, then, Cassie thought. She slipped out of the far side of her bed, creeping silently, head bowed to avoid the top drapes of the den, until she found her way to her brother's side. She knelt down, laying her hand on the nape of the boy's neck. Robin stirred within seconds.
"Hi, Cass."
The girl kissed his cheek. "Hi, Robbie." The boy smiled gently. No-one, no-one at all, was allowed to call him Robbie. Except his sister. Any more than anyone other than Robin was allowed to call his sister Cass. It was the siblings' secret code of their love for each other. Cassie took Robin's hand, squeezing it gently.
"Robbie...." the girl began hesitantly. "W....what were you doing....before? I....it looked like....you were....really enjoying it. D....did it feel good?"
Robin's cheeks flushed a little, and he paused a moment before answering. He'd planned to let one or other of the girls catch him, as Lucas had been caught, but there was still an undercurrent of embarrassment that Cassie had seen him....playing, as he called it in his head.
"Y....yeah, it felt great, the best one I've had, I think. It was....exciting, kind of knowing you and Amber were watching."
"Do you do it lots, then?"
"I....I dunno - most days, I suppose. I haven't been doing it long, though, Charlie taught me how when we had that sleepover just before we went back to school after Easter."
There was a long silence, but there seemed to be some kind of unspoken communication between brother and sister. Cassie, barely, managed to speak first.
"C....can you....show me how it works, Robbie? Please?"
Robin felt like squadrons of butterflies were practising aerobatics in his stomach - and he knew, too, that he was as hard as he'd ever been in his life. The prospect of any sort of sexual play with his gorgeous, beloved sister was so exciting to the boy that he was almost hyperventilating.
Y....yeah - if....if you want." Cassie looked at him, a serious but expectant expression on her face. There was a last thought, in the back of Robin's mind, that maybe he shouldn't go through with it, that she was his sister, after all, but the near-pubescent hormones coursing through his body washed the final shreds of inhibition away, and he pulled his blanket aside. Cassie gasped.
"Robbie - it's s....so big! Do all boys'....penises get this big when they're feeling....sexy?"
"I....I don't think so, I think mine's....bigger than usual for my age. But Dad's got a big one, too, you know, don't you, you've seen him undressed. Maybe it runs in the family."
"I....it's....beautiful, Robbie!" Cassie lowered her eyes, and drew in a deep breath. "C....can I....touch it....please?"
The boy shuddered involuntarily. "Yeah....I....I'd love you to, Cass!"
Cassie reached out, her fingertips barely grazing the pale pink, swollen flesh. Robin squirmed. The girl's fingers curled gently around his shaft, just applying enough pressure to allow her to gauge the rigidity in her grasp. The boy moaned, much more loudly than he would have wanted. Cassie withdrew as if she'd been stung.
"S....sorry, Robbie! I hurt you, didn't I?"
"N....no, no way, Cass! It felt....awesome! Do it again!" The girl did as she'd been bidden, taking her brother in hand once more. "Oh Cass, that's so nice! Hold it near the top, where the skin joins, and rub up and down, slowly, though, please."
The girl didn't quite get the gist immediately, so Robin carefully guided her hand, and its movements, to maximise his pleasure. After a few seconds, he laid back, let go, and simply luxuriated in the feelings his sister was inducing in his raging body.
"Ooohhh, Cassie, that's perfect, just keep doing it like that!"
In little more than a minute, Robin's body shivered out of control.
"Faster, Cass, faster! Don't stop, please! I....I'm gonna....!"
His orgasm hit with unbelievable force, the delirious spasms surging, it seemed, from somewhere much deeper inside than anything he'd experienced before. The boy's hips thrust up instinctively into Cassie's coaxing hand, his penis bucking against her fingers. All too soon, the corporeal fireworks were over, Robin slumping back onto the foam pad beneath him, panting like he'd just been running for his life.
"Ooohhh Cass, that was soooo good! I love you!"
The girl smiled, but her confusion was obvious. "I....I love you, too, Robbie, b....but I still d....don't understand w....what happened to you."
The boy reached up and drew Cassie gently down towards him, kissing her softly on the lips, before turning on his side and encouraging her to lie close beside him, almost nose to nose.
"I....I don't know that much about it, either, Cass, only what Charlie told me. He did tell me the proper name for it, for the feelings, I mean, but I can't remember it - or....or-something - but he said Lucas told him most people call it 'cumming', spelt with a 'u', not an 'o'. He said it's when the sperms come out when you have sex, but Charlie and I aren't old enough to make sperms yet, it doesn't usually start until you're 12 or 13, Lucas said. Charlie said he saw Lucas squirt his sperms out, though, so that means Lucas could get a girl pregnant, if she'd started her....periods."
"Mum told me about periods," Cassie said, almost to herself. "She told me as well that girls get wet in their....pussy when they're feeling sexy, like boys get....hard. Can girls do....cumming, too?"
"I don't know," Robin admitted. "Girls don't make sperms, though, they have eggs instead that the sperm joins with to make babies when they're older, we learned about that at school. Does it feel good, like kind of tingly-tickly, if you touch yourself? That's what it feels like when I touch my....dick, and then when I rub it, it keeps getting better and better until I get the cumming feelings, so if you feel like that, you should get the feelings, too".
" Y....yeah, Robbie, it does sort-of feel like that. A....and I'm really ....wet....down there at the moment."
Robin looked into his sister's eyes for long seconds, the butterflies taking wing once more. "S....shall we try, Cass? C....can I touch you, try and make you feel as good as you made me feel? Please?"
Cassie gently pressed her lips to Robin's once more. "I....I'd really like that, Robbie," she breathed.
"I....I've never touched a girl before - c....can you show me the best way to....do it, so I don't hurt you, and so it feels nice for you?"
Cassie nodded, mutely, a flush of desire painting her beautiful face. Robin gently nudged her onto her back before moving to kneel beside her, his eyes unwaveringly on the girl's. As though those eyes had asked her aloud, Cassie shifted her hips and quickly lowered her pyjama bottoms and panties, Robin helping her to slide them over her ankles and off. The boy's gaze shifted, as though drawn by a magnet, to the thin, hairless slit between his sister's legs, faintly glistening with moisture in the dim light. The sight caused his penis to throb back, almost instantaneously, to full erection.
"Oh, wow! You....you're beautiful, too, Cass!" Robin extended his arm, his hand moulding itself to the silky softness of Cassie's pubis, his forefinger finding the narrow valley of her vulva. He began to rub softly, slowly, rhythmically, the digit slipping easily up and down, aided by the natural lubricant trickling from within the girl's body. Cassie sighed in pleasure.
"Oh, Robbie, that feels lovely, much better than when I touch myself! Stop, just for a second, though, I want to show you something." Robin, reluctantly, lifted his hand from his sister's body. Cassie's left hand reached down and parted her outer lips, the boy gasping as the never before seen inner anatomy came into view. Cassie used her other hand to point to a small bump near the top of her slit. "Look, Robbie, see that place?" The boy nodded, eagerly. "That's where it's most sensitive. It feels really tingly if you touch it. Be really gentle with it, though, please."
The boy nodded, before quickly leaning down to kiss the girl once more.
"Course, Cass," he whispered, almost into her mouth. "Just tell me if I do it wrong."
The siblings adjusted their positions once more, Cassie parting her thighs wider, and Robin kneeling between them. The boy used the fingers of his left hand to part the outer lips, as he'd been shown, then, as carefully as he could, brought one fingertip to the girl's 'sensitive place'. He tickled it lightly, and Cassie shivered.
"Ooohhh yes, Robbie, feels so good! Keep doing it, just like that!"
Robin continued his gentle caresses, and now that he was confident he was touching his sister in the best place for her, he moved his left hand lower, to explore further. He felt the wetness increase, and within moments, had found its source. That must be her....pussy hole, the vagina, as they'd called it in the lesson at school, he thought, where my dick would go if....if we had....real sex. His penis lurched at the idea, the boy felt as though he was close to cumming again, and without even touching himself. As carefully as he was touching his sister's 'pleasure bump', he began to probe at the inner lips with another finger. Just at that moment, Cassie's rising excitement caused her hips to lift, and Robin's finger sank at least a couple of centimetres into the tunnel of flesh. Cassie groaned.
"Ooohhh Robbie, oh yeah, do it more! Do it deeper!"
Cassie was an active girl, far more athletically inclined than Robin himself, taking part in gymnastics and riding her bike regularly, and, as a result, her hymen had been broken at some indeterminate time in the past, meaning that there was no resistance at all to Robin's finger as it slid all the way into her buttery depths. The girl began to tremble, uncontrollably.
"Something's happening, Robbie, don't stop! I'm getting....the feelings....r....right now!"
Cassie whimpered, and the boy felt the muscles around his finger begin to contract, over and over. She's cumming, he knew instinctively, the realisation touching off another climax in the boy's own body, as though it was his penis buried in her grasping sheath. After long seconds of mind-melting pleasure for both siblings, Cassie slumped back to the mattress, pulling Robin down on top of her. They hugged each other as closely as at any time in their lives. Robin's still throbbing penis slid against Cassie's wetness, causing them both to groan aloud.
"Put it....inside, Robbie. I....I really want to!"
"A...are you sure, Cass?" The boy could hardly believe his ears.
"Really, really, sure! Your finger felt amazing in there, y....your....dick will feel ten times better, I know it! And we can't accidentally make a baby, because you haven't got any sperms yet, and I haven't started my periods. Please, Robbie, let's do sex together!"
"B....but it's bigger than my finger, Cass. I....I don't want to hurt you. I....love you, more than anyone!"
"It's longer than your finger, but not much fatter," the girl countered. "Let's try, Robbie, please. If it hurts, I'll tell you, I promise, and we can stop. Kneel up for a second."
Robin did as she'd asked, and Cassie slid lower, raised her knees and splayed her thighs as wide as she comfortably could, placing herself, although she couldn't have known it, in the classic 'missionary position'. Then she reached out, taking her brother's erection tenderly between her fingers, guiding him to her threshold.
"Push in, darling Robbie, gently, though, slowly as you can."
Robin felt the wetness against the tip of his glans and groaned in his excitement. He edged his hips forward a few millimetres, but seemed to make no progress. Cassie caught her breath. The boy stopped.
"It won't go, Cass," he breathed.
"It will, Robbie. Push a little bit harder."
Robin tried again, and, at the same moment, Cassie rose up a little to meet him. As it had been when the boy had first penetrated her with his finger, there was an almost instantaneous movement of a few centimetres, from outside to in. Cassie grunted, impossible for her brother to know whether the sound was born of pain or pleasure.
"Are you OK, Cass?" he asked urgently.
"Y....yeah, feels good. Feels big, though."
"Shall I take it out?"
"N....no, just give me a second to get used to it."
Robin looked once more into his sister's eyes, and while being careful to keep his hips still, touched his lips to hers. This time, both boy and girl instinctively opened their mouths a little, the tips of their tongues coming together, each tasting the other for the first time. Cassie broke the kiss, looking up adoringly at her brother.
"Now, Robbie, put it all inside me now!"
Robin began easing forward once more, shaking, it felt to him, from head to foot. The warmth, the slick lubricity, the tightness he felt engulfing his boyhood was simply overwhelming. By the time he felt the skin of his hairless pubic mound touch his sister's, the gentle kiss of their flesh signalling, unequivocally, the loss of their virginities, he was close to tears, as much from the emotional overload as from the exquisite physical sensations.
"Oh, Cassie, oh, I....it....it's so, so good! I....I never knew....anything could feel so....wonderful! Does it feel good to you, too, Cass? I w....want it to feel as g....good for you as it does for me, really."
"I....it's amazing, Robbie, just amazing! I feel so full, but it's so brilliant! Go in and out, that's what we're supposed to do, isn't it?"
"Y....yeah, I....I think so. I'll try."
Robin drew back slightly, before once more sinking slowly, fully into his sister's clinging depths, causing them both to sigh at the delicious feelings. Naturally, Robin's inexperience meant that he took a little time to find a smooth rhythm, although he did have the advantage that his long penis meant that the risk of him slipping out of his sister was close to zero. After a couple of dozen thrusts, though, the boy had begun to find the optimum length and speed of stroke, his increasing confidence translating directly into increasing pleasure for both siblings.
"Ooohhh Robbie, so good! You're rubbing against something really nice inside me, it feels fantastic!"
"Cass, it's so fantastic for me, too. I can't believe it, I'm so lucky! I'm h....having....sex w....with the most beautiful girl in the world! I love you so much!"
"I love you too, I can't believe there's a better brother anywhere! Go faster, Robbie, I....I'm going to get the....cumming feelings again, really soon!"
Cassie lifted her legs higher, wrapping herself around Robin's slender hips, seemingly wanting to draw him even deeper into her heaving body. The boy increased the pace and intensity of his thrusting, to the point that a faint clapping sound could be heard in the den as the siblings' bodies came together, again and again. Cassie's breathing quickened rapidly, turning to almost sobbing pants as her excitement reached boiling point. Suddenly, Robin felt a gush of extra wetness around his throbbing erection, then a series of pulsing squeezes as his sister hit her peak.
"Ooohhh yessss! Don't stop, Robbie, please don't stop!"
Robin had no intention of stopping, his own release, he knew, was only seconds away. Twenty, ten, five more jackrabbit thrusts, before the ecstasy hit him like a runaway train, his whole body feeling like it was on fire, his penis seeming as though it might burst at any second before erupting into a series of huge dry spasms, stronger by far than anything he could have imagined. Time had stopped, all that existed for the boy was the searing pleasure exploding through his genitals. His body was on autopilot, his hips somehow continuing to pump without any hint of conscious control. Somewhere, far in the distance, he was dimly aware of Cassie whimpering, then felt the girl's muscles tighten against him once more as she reached a second climax, wringing even more delight from his nearly exhausted body. Then, like a curtain falling, it was all over. Robin's movements stuttered, once, twice, then came to a halt. He had just enough strength left to avoid outrightly collapsing onto his sister's body, easing his light frame down until they were touching almost from head to toe. After long moments of panting breaths from both girl and boy, their lips found each other once more, and they kissed, gently, tenderly. There were no words, both instinctively knew none were necessary. Neither had any doubt, despite their youth, that they had just shared one of the cardinal moments of their lives. Robin's penis slowly softened, and, eventually, slipped from his sister's liquid embrace. Cassie sighed.
"W....we can do that again, soon, can't we, Robbie?" she murmured.
"I....if you want to, Cass, course we can. We'll have to be....careful, though, if anyone finds out....I....I don't know what....would happen."
Cassie nodded unhesitatingly, realising her brother was right. What the siblings had forgotten, though, first in the excitement of their voyage of mutual discovery, and then in the contented afterglow of their lovemaking, was that they weren't alone.
Amber laid awake, her heart pounding in her chest, her mind in turmoil. She'd woken some half an hour earlier, immediately aware that Cassie wasn't lying beside her. After blinking several times as her vision adapted to the low light, she saw her friend kneeling beside Robin's bed. Just then, the boy peeled his blanket away in response to something his sister had said. Amber gasped as Robin's lower body came into view once more, her focus on the long, thin stalk of flesh jutting from between his legs. Her eyes went wide with disbelief as Cassie reached out and....touched it! If that first touch had shocked Amber, what followed as the minutes progressed was completely beyond the girl's comprehension. Cassie had stroked Robin as the boy had done to himself earlier, with, apparently, the same result, they'd then changed places, Robin using his fingers gently to Cassie's obvious delight. Amber squinted to see what the boy was doing to give her best friend such pleasure, just in time to see Robin's forefinger disappear inside Cassie's body. The effect on Cassie was electrifying, she shook, moaned, whimpered, but obviously not due to any sort of pain. Amber's hand, almost unconsciously, slipped beneath the thin material of her underwear, touching what, for her, was almost unknown territory, trying to understand what her best friend was feeling. Robin and Cassie had moved again, laying close together, wrapped in each others' arms. In the absolute silence of the den, some of the siblings' low whispers were loud enough for Amber to overhear, but what she heard next, she simply couldn't believe. 'Put it inside', that couldn't be what Cassie had said. Could it? That would mean....they were going to....have sex? Amber wrenched her hand away from her body. They can't! It....it's wrong, it's....dirty! Amber, just once, a year earlier, had asked her mother, after watching a TV programme about young animals, how people had babies. The look of distaste on her mother's face had been so pronounced that even a nine year old couldn't possibly mistake it. You don't need to know about dirty things like that, the woman had said sternly, almost angrily, that's for when you're grown up, and married. Robin and Cassie weren't grown up, though, and they couldn't get married even if they were, brothers and sisters weren't allowed to, Amber knew that. Didn't they know it was wrong? Amber wanted to stop them, somehow. Should she just tell them not to do it? Should she go and tell Mr and Mrs Beaumont what was happening? Amber was frozen in place, though, unable to drag her eyes away from the unfolding drama little more than a metre away. Robin was now kneeling between his sister's legs, Cassie was guiding his....boything, closer, closer, touching, a momentary hiatus and an exchange of whispers, then - Cassie made a noise that sounded to Amber like her friend had been punched in the stomach, as the top part of Robin's spike disappeared inside his sister's body. Another pause, more words, below the threshold of audibility this time, and then Robin moved forward again. Amber forgot to breathe as the boy's whole length was slowly swallowed by Cassie's insides, until their....private bits were touching together. Then they started moving, well, mostly Robin moving, although Cassie put her legs up and gripped around his....bum after a minute or so, like she wanted the boy to be even deeper inside her. They both looked as though they were in heaven, Amber thought, and, once more, her hand found its way inside her panties, her finger creeping into the deep cleft of her vulva, as she'd seen Robin do with Cassie, just minutes earlier. Amber felt dampness that she knew wasn't wee, even if she didn't know what it actually was, and, as she pressed a little more firmly, caught her breath as a spark of pleasure emanated from somewhere beneath. She moved her finger, experienced another jolt of good feelings, homed in instinctively on the source, a firm feeling lump near the top of her slit, began to slide her fingertip across and around it carefully. She could feel herself becoming wetter, and moved her other hand to investigate. She prodded, hesitantly, at herself for a second or two, then had to almost bite her tongue to avoid crying out as the finger found the opening, and slipped inside to the first joint. That's it, she knew at once, that's where Robin's thing had gone into Cassie! Before she could process her discovery, though, her attention was dragged back to the siblings, as their movements and panting breaths seemed to signal a crucial moment. 'Oh yes, don't stop', Amber heard her friend gasp, while Robin's hips pumped so fast that the girl thought he must be hurting himself, or Cassie, or both of them. But then the frenzy was over, Robin stopped moving and laid carefully down on top of Cassie, they kissed, several times, before finally moving a little apart and sharing another inaudible conversation. Amber caught a glimpse of Robin's 'boything', now seemingly soft and floppy, but visibly wet, from the moisture of Cassie's insides, she realised. Brother and sister languidly retrieved their discarded nightclothes, and dressed slowly, before cuddling together on Robin's bed, the boy behind his sister, their bodies moulded together. It took no time at all until both were asleep. The same couldn't be said for Amber. She simply couldn't equate the 'dirtiness' her mother had referred to with what she'd been observing. Cassie and Robin's pleasure, closeness and love for each other were plain to see - and totally beautiful, not dirty at all. Amber yearned for someone to kiss her like the siblings had kissed each other, to touch her like they had touched. When she did eventually fall into a fitful sleep, it was with tears in her eyes.
****
"You'd better get back into your own bed, Cass," Robin murmured sleepily. "We don't want Mum and Dad finding us like this."
"Do I have to, Robbie?" Cassie asked with obvious disappointment. "Can't we just say I had a bad dream, or something, and that you were looking after me?"
It was 6:00, and the early light of a bright Spring morning was already seeping into the den, even through the heavy material of which it was constructed. "Amber's here, too, don't forget."
"I suppose so," Cassie replied with resignation in her voice. "It's really nice, you cuddling up to me like this, though."
"I know, it's really good for me, too. W....what we....did last night was too fantastic for words, though, a....and I want to do it....lots more, a....as long as you....want to, as well. But if we get....caught...." The boy's voice tailed off, but the message he was trying to convey was crystal clear.
Cassie rolled to face her brother, unhesitatingly planting a melting kiss on his thin lips. "Me, too, Robbie, I want to do it whenever we can. It was the....best thing, ever, ever!"
"I love you, Cass."
"I love you, t...."
"I saw you." The siblings jumped almost out of their skins, the blood draining from their faces. "I watched you....doing it!"
Robin and Cassie moved to cling to each other as if they'd just heard a death sentence. Amber continued, her voice seemingly emotionless, all the more chilling for its neutrality. "Why did you do it? Children aren't supposed to, it's only for grown-ups. My mum said so." Neither sibling could find so much as a word, still less a coherent answer. Amber focused her attention on her best friend, her icy carapace dissolving by the second. "D....did you like it, Cassie? Did it feel good?" Cassie nodded, mutely. "And Robin didn't hurt you?"
"N....no, Amber, really! It felt....weird, just for a second, sort of....too full, when he first put his....dick inside me, but it didn't....hurt, I promise! And then it started feeling really, really nice, really quickly."
"Are you....going to tell on us?" Robin asked, nervously.
Amber looked at the boy blankly, as though the question had been asked in some incomprehensible language. Cassie picked up on her friend's hesitant confusion.
"Please don't tell, Amber! I don't want Robbie....Robin to get in trouble, I love him, loads!"
"I....I don't know....w....what to do...." Amber began, but her overwrought emotions caught up with her, and she started to cry. Cassie instantly disentangled herself from Robin, scooted across to her friend's side, and wrapped her up in a close hug.
"Don't cry, Amber, please don't!"
"S....sorry, Cassie," Amber managed after a few moments. "I....it's just that....I don't....understand. Mummy says....it's dirty, b....but you a....and Robin....well, it didn't look....dirty at all. I....it looked....lovely."
"It was lovely, Amber. Robin made me feel better than I've ever felt in my whole life." Cassie paused. "H....have you....ever touched yourself....down there?"
Amber flushed with embarrassment. "No! Well, n....not really. M....maybe a....little bit, when I was....watching y....you and Robin....doing it."
"Did you like it?"
"I....I don't know - I....I suppose so. I got....all wet. D....does that happen....to you, too?"
Cassie smiled. "Yeah! That's what supposed to happen when you're feeling....sexy. Mum told me about it. Like Robin's....dick gets....hard. Boys get hard, and girls get....wet. I....it's so the boy....can go....inside the girl more easily."
"Did your mum tell you that?"
"No, but I....kind of worked it out, earlier on. When Robin first put....his finger in me, it slid right down inside, really easily, and didn't hurt at all. It wouldn't have been like that if I hadn't been....slippery, I bet!"
"And it really felt....nice, having....something....inside you, like that?"
"Honestly, it felt great!" Cassie looked into her friend's eyes. "Y....you should....try it, Amber. Then you'd find out for yourself!"
Amber's head felt like it was about to explode. The diametric opposites, her mother's utter disapproval against Cassie's enthusiastic advocacy, were too much for her to come to terms with. Not knowing, at all, what to say, she said nothing. She felt Cassie snuggling closer to her, sensed her friend's warm breath beside her ear.
"Do you want to, Amber - try, I mean? I'll show you what to do, if you want."
Once more, Amber couldn't find any kind of reply. Cassie decided that her friend's lack of a rebuttal was close enough to assent, and gently slipped her hand between Amber's legs, outside her nightclothes, cupping her pubis. There was a momentary, instinctive closing of Amber's legs, but all that was achieved was to increase the pressure of Cassie's touch, sending a warm wave of pleasure through Amber's lower body. The girl moaned softly.
"Nice?" Cassie whispered.
"Mmmm, I like that."
"Shall I carry on?" Amber nodded slightly, and Cassie began to move her hand slowly, massaging the sensitive area carefully. Amber, after a few seconds, began unconsciously pushing herself up into Cassie's palm. Her eyes closed, while her lips parted a little as the new and exciting feelings began to build.
"Let's get....undressed, Amber," Cassie whispered, "it feels better....naked."
Once more, Amber didn't demur, so Cassie gripped the waistband of her friend's pyjamas, and began to ease them over the girl's hips. Amber neither resisted nor assisted, but, within seconds, only her underwear was covering her girlhood. Cassie touched the front of Amber's panties gently.
"Gosh, you are wet! Shall we take these off, too?"
Amber's underwear quickly went the way of her pyjamas, followed by the T-shirt she was wearing. Cassie and, behind her, Robin, both gasped.
"Wow, Amber!" Cassie exclaimed. "Your....boobs are....so nice!"
Cassie was more or less completely flat-chested, but her friend had undoubtedly begun the voyage into puberty - her nipples were probably twice as big as Cassie's, atop breast buds each the size and shape of half an egg. Robin, in particular, was totally fascinated by Amber's form and shape, his penis responding accordingly, completely rigid in moments.
"A....Amber?" the boy breathed. "Can I touch your tits....I....I mean your....breasts, please? They really look...awesome!"
Amber looked almost panic-stricken, impelling Robin to try and reassure her. "I'll be ever so careful, I promise."
"O....OK," Amber replied, before drawing in a huge breath as Cassie's fingers gently touched her naked flesh for the first time. Robin crossed the den to Amber's left hand side, then tentatively reached out, allowing his fingertips to brush lightly against Amber's nipples, first the left, then the right.
"Ooohhh, Robin! Do that again, that's sooo nice!"
The boy shifted his position a little, kneeling close to Amber so that he could use both hands on her body. He ran the balls of his thumbs across the sensitive nubs, delighted to see and feel them growing and stiffening at his touch. Meanwhile, his sister had begun to dip a finger between Amber's labia, slipping easily through the girl's increasing wetness. Amber instinctively spread her legs wider as her pleasure leapt to previously unimagined heights, her eyes closed and her head beginning to loll left, then right, as the siblings continued their gentle ministrations. Much as Cassie had earlier, in response to her brother's stimulation, Amber's hips lifted, causing her friend's fingertip to penetrate the inner lips, and slip a centimetre or so into her sopping vagina. Amber groaned at the new sensation, thrusting up deliberately to impale herself on Cassie's probing finger.
"Ooohhh yessss! Oh, Cassie, that feels wonderful! More, please, more!" The girl was getting a little over volume, Cassie shushing her urgently, lest her parents should hear. With all the willpower she possessed. Amber forced herself to remain silent as the combined delights of three hands on and inside her body tipped her over the edge of her first ever orgasm, her hips jerking spasmodically as Cassie continued to slide her finger rapidly in and out of her grasping tunnel of flesh. Then it was all over, Amber's body suddenly seeming to lose all its strength as she flopped back heavily onto the mattress, her breath coming in huge gasps.
"Ooohhh, wow!" Amber exclaimed after long seconds. "Wow, wow, wow! That was....was....unbelievable! Did it feel that good when you and Robin were....doing it, Cassie?"
Cassie nodded, wordlessly. Amber turned her head to look at the boy, her gaze falling greedily on the, to her, massive bulge in Robin's pyjama trousers, before looking into the boy's eyes.
"I....I want to try it, t....too. C....can we, Robin....please, please?"
Brother and sister looked at each other, amazed at the sudden change in Amber's demeanour, from the demure, innocent girl they'd known for years, to this....hunger, there was no other word for it.
"W....would you m....mind if we....did, Cass?" The boy felt like he'd almost forgotten how to speak, such was his excitement.
Cassie's emotions were almost painfully mixed. She wanted her brother to give and get the same pleasure with Amber as they'd shared just a few short hours before, wanted her friend to experience the delights of the ultimate act of intimacy, but she couldn't help but feel that Robin should be hers, and hers alone. Seconds passed. Amber broke the tableau.
"Please, Cassie! I know you and Robin....really love each other, but I....want to try, so much. Please can we? Just this once?"
Even as Cassie's mouth opened, she seemed hardly to know which words would emerge. "O....OK, then, as long as Robin....doesn't mind, I d....don't."
Robin smiled straight into his sister's eyes, before leaning across and kissing her lips gently, lovingly. He moved his face close to Cassie's ear, whispering almost inaudibly.
"I....it'll be different, Cass, I know. I don't....love Amber, b....but I really, really love you, and I always will, I promise. Thank you for letting me....try with Amber." The siblings kissed again, before Robin quickly shucked his nightclothes and turned his attention to the girl at the centre of the bed. Amber reached out and took the boy's erection carefully in her hand, exploring its shape and texture.
"I....it feels....so hard, Robin. Will it hurt when you...put it in....inside."
"I....I'll be as careful as I can, Amber, promise. D....do you want....to do it now?"
"Oh yes, yes please!" The youngsters arranged themselves as the siblings had earlier, Robin guiding Amber's hips lower and wider, kneeling between them. This time, it was his hand that moved his own penis to touch Amber's wetness.
"Ready?" The girl nodded, and Robin slowly, slowly, moved his hips forward, feeling the slickness and heat of a girl's body begin to envelope him for the second time in his life. Amber whimpered, just once, as a small sting of discomfort shot through her lower body, but it passed in a handful of heartbeats as the boy continued to carefully penetrate her depths, until there was no further to go. Their eyes met.
"OK, Amber?"
"Y....yeah. It feels....oh, it feels great!"
"I'm going to start....doing it. If you want me to stop, or do it....differently, just tell me, OK"
The girl smiled. "OK, Robin!"
The boy's thighs drew back, then thrust forward firmly, finding a smooth, slowish rhythm almost immediately.
"Uh....uh....uh," the girl grunted in time with Robin's movements. "Uh....y....yeah....just....like....that, i...it....feels....fantastic!" Within a couple of minutes, the girl began to pant heavily. "T....the....feelings....you're....going....to....give me....the....feelings!" Robin increased his pace markedly, and Amber crashed into climax, burying her face in Robin's shoulder to prevent herself crying out as the pangs of ecstasy coursed through her young body. Neither boy nor girl knew about multiple orgasms, needless to say, but Amber experienced just that, a second peak, almost as intense as the first, rippling through her just as she felt Robin's hardness begin to pulse wildly inside her as he went over the edge himself, the boy groaning aloud at the glorious sensations. Movements slowed to a stop, and Robin withdrew, breathless.
"Th....thank you, Robin, that was....so good. And thank you, Cassie, for sharing Robin with me. You're the best friend I could possibly have!"
Cassie smiled, genuinely happily. She really liked Amber, she loved Robin more than ever, and watching her best friend and brother together had been unexpectedly exciting, too. Cassie looked at Robin, grinning wickedly.
"Reckon you can do it again?" The boy's penis had begun to wilt, but quickly reversed direction at his sister's words. He nodded enthusiastically. "Good, because I want my turn!"
Two hours later, Mr and Mrs Beaumont walked into the living room, the woman lifting a corner of the drapes to take a surreptitious peek into the den. All three youngsters were in their respective beds, sleeping like babies. Mrs Beaumont smiled knowingly at her husband.
"Up half the night talking, I bet! Shall we give them another hour before I start sorting their breakfast out?"
"Don't see why not," the man replied. "It'll be nice for us to be able to have our breakfast in peace, for once!"
****
Charlie made a beeline for Robin as they made their way into school on Monday morning.
"Get to snog Amber the other night?"
Robin smiled crookedly, blushing a little. "Nah," he replied, truthfully.
"Wuss!" Charlie smirked. "I learned something new from Luc. It was great! I'll show you next time we have a sleepover! What about at mine this weekend?"
"I'll ask Mum and Dad!" Robin grinned. I bet you didn't learn as much as me, though, he thought smugly.
****
Love & best wishes to all
Sammy B
****
This might be the first in a series of adventures for Cassie, Robin and their friends - I like the siblings a lot! As ever with my literary endeavours, no promises, though!
SB
