“I’m bored of video games.”

“You’re bored of everything!” Chris said, giving Heather a sideways glare.

“Well it’s just—” she bit her lip, frustrated, “You keep always beating me, because you already play it a ton!”

“So you want me to go easy on you?” the boy said looking at the slim girl skeptically.

“Maybe I wanna do something else,” she huffed, blushing and looking the other way.

“Like what?” he asked, in an honest curiosity that brought her to look him in the eyes again.

“I um... don’t know what it’s called,” she said cautiously, sinking down to sit on her knees, facing him. “I saw my dad doing it though, and it looked really fun.”

“So what was he doing?” Chris asked curiously, sitting on the floor with his legs kicked off to the side.

“I-it’s kind of gross, but it really really did look fun,” she said, eyeing her friend warily, “I couldn’t stop looking, and I really wanted to do it. So I was hoping instead of video games, we could... I mean you’re a boy.”

“Yeah?” he replied.

“So that means you have a penis, right?” Heather asked.

Blushing, Chris said, “Y-yeah? That’s sort of what boys have?”

“Well, girls don’t,” Heather said, blushing herself as she looked away. “I don’t have a penis,” she muttered tensely.

“Well what do you have?” Chris asked, having never actually thought about that before.

“I have a... a place for a penis to go,” she said, “Just like my dad’s girlfriend. He put his penis inside her.”

“...huh?” Chris said, blanking as he looked uncomprehendingly at Heather’s groin. “You have a... place?”

“I wanna show you,” she said hastily, “But it means I have to get naked, and we’re not supposed to. But I swear it looked so fun, I... I mean if I take off my clothes, you won’t... tell on me, will you?”

Gaping at Heather in amazement, he said, “No, I’d never! I’m your friend! I... I haven’t ever seen a girl without clothes. You really don’t have a... penis?”

Smiling in excited relief, Heather said, “Here, lemme show you.” She fingered the hem of her pants, pulling them down to her ankles, and wiggling them off. Then she slid her panties away, showing him the smooth curve of her groin. “S-see?” she said, biting her lip, “No penis.”

“Wow...” he said, looking at what seemed to be a soft slit in her otherwise unbroken pelvis. No penis, no balls, just her... legs coming together with nothing hanging in between them.

“You know, I–I saw my daddy without clothes,” Heather said hopefully, “But I haven’t seen you without clothes.”

“O-oh right, of course,” he said, looking away to take off his own pants. She wiggled out of her panties, while he pulled down his pants and underwear, and now it was her turn to say,

“Wow...”

“Um... you like it?” Chris said, leaning back awkwardly to try and show her his naked pelvis.

“Yeah, it’s just... you have a thing there that goes into girls,” Heather replied engrossedly, “It’s smaller than I thought it would be.”

“Is that bad?” he asked, blushing.

Blinking, she looked up to meet his eyes, going, “No, no! It’s fine. It gets lots bigger when you rub it. And I can’t fit very much. Um. Inside me.”

Before he could question that, Heather lay back again, spreading her legs, then spreading open her gleaming labia with two fingers. “See how it’s pink in there?” she asked, “It just sort of... keeps going into me. I tried putting some stuff in there, p-pretending it was Daddy’s penis, but I dunno. I just wanted to try um... yours.”

“S-so you just... sit on my lap or something?” he asked thoughtfully.

Shaking her head, Heather said, “No what my dad did was climb on top of her. She laid on her back, like...” Heather lay back, sticking her head up to declare to Chris, “Like this. And he just... got on top of her. Like a sideways hug. And his penis was in just the right place to go in...” Heather fiddled with her labia, already imagining it.

“I can do that,” Chris said, starting to climb to his hands and knees, wanting to do that to her more than he felt like he should.

“No, wait,” she blurted out. Chris froze. “You have to get your penis big first,” she said, “My daddy’s friend did it by rubbing him with her hands.”

“Oh so you’d... touch my penis,” Chris said, shrinking back shyly.

“Yeah I’d... touch your penis a lot,” she admitted, blushing, “The... girl place in me really touches things all over, so my hands wouldn’t be any worse.”

“No, no it’s okay, just kind of... weird,” he admitted. When she didn’t seem consoled, he lay back and spread his legs, saying, “Go ahead, do your thing. I wanna see my penis get big.”

“O-okay, thanks Chris,” Heather said again in relief. “Don’t worry I’ll be careful.”

She gently touched his pelvis then, and he shivered when she lifted his penis in her fingertips, then curiously explored his soft testicles. “That does feel really weird,” he said tensely. “Not bad though!” he added when she froze, “Just... have fun?”

“So your pee comes outta here, huh,” she said enthralled at the soft velvety flesh she stroked.

“It’s the... same as... I mean how do you pee?” he asked, confused at the pleasure flowing in his groin.

“It just... sorta comes out,” she admitted, “Maybe I’ll show you after, but now I wanna do the sex thing.”

She stroked his penis until something started flexing in there and it started plumping up. “Oh wow,” she declared.

“I think it’s getting bigger,” he said, equally engrossed with his own anatomy.

Soon she said, “I... I can get my whole hand around it.”

“Yeah it’s...” he panted intensely, his heart pounding, “It’s getting really long.”

“And thick,” she said entrancedly, stroking it more and more, “And hard. It’s not as soft anymore. There’s really hard um... stuff here.” She squeezed his penis in her fingertips, making him groan.

“N-no it’s okay,” he stuttered immediately, “It just felt good when you... squeezed it.”

“I think it’s...” she said, pulling her hand away for the boy’s erect shaft to dangle forward, “I think it’s big enough. Now can you see how that’d go into me?”

Looking at her smooth groin, Chris still couldn’t really fathom it. This big thing went into that little... dent in her pelvis.

“I’ll show you, c’mon and hug me,” she said, laying back and raising up her arms.

He did so, and his penis bumped right into her warm labia. “Mmm... I really feel it,” she said in delight, then took his penis in her fingertips again, working it deeper into herself. “Just push it up... like um... ooh...”

So engrossed with the sensation of pushing a penis inside her, she forgot there was a boy attached to it. With a hunger surging in him at her tantalizing wetness, he pushed forward, squishing her hand between them as he sank into her all the way.

“M...my hand’s... stuck,” she said in shock.

“You really are,” he said in amazement, “My whole penis just... fits in you.”

“It’s... really soft, but also hard,” she said, freeing her hand and poking at her own belly, “Not like the brush handle. F-feels good for you?”

“You’re so hot inside,” he replied, grinding against her pelvis.

“That’s...” she blushed heavily, “J-just what my daddy said.”

“Wow,” he said, squirming against her as his penis moved within her in so weirdly a compelling manner, “I really like this. My penis is so... achey, and you’re all... s-squishy and hugging me in there. I love being inside you!”

“I-I don’t know if it feels good,” Heather said uncertainly, bracing her palms on Chris’s shirt as below the waist they were naked and ready to fill her with babies, “It’s just so... weird having you close to me, and... and your actual penis just got big and went in there. A-and I can feel it.”

“Hee hee, you can feel my penis with your girl place,” he said in amusement. “I love how wet and... and hot you are. You can be as slimy as you want, as long as I can put my penis in there.”

“I’ll try if I can,” she said hopefully, “All I know is your penis’s really soft and hard. I can feel you with my girl place.” In wonder, breathing harder, Heather said, “I have a place that can just feel you. I feel... myself hugging all around your penis, and my girl place... loves feeling a penis inside her.”

“Yeah, I...” he started to pull out but pushed back in again, making both kids gasp. “I love feeling your girl place with my penis,” he replied, “You feel all... slimy and squeezy, and I love it. I... I never wanna leave.”

“Are you gonna... cum inside me?” she asked shyly.

“Aren’t I already inside you?” he asked, lust fading a little to confusion.

Blushing, Heather explained, “That’s what my dad said, that he was gonna cum inside his friend. A-and fill her with his... seed.”

“I... I dunno?” Chris said uncertainly, shifting his hips against hers, causing a slight thrusting as he explored the feeling down there. “All I know is it feels really good. I’ll um... do you want to be filled with seed?”

“I um...” she looked down at where he was penetrating her, then looked up at him again. “M-my girl place likes to be filled,” she said shyly, “So if you can f-fill it more, go ahead.”

“I wouldn’t know how,” he complained, swivelling around, and pulling out again before pushing in. “Ohh that feels...” he said in wonder as lust clouded both their brains with another thrust in her, then another.

Soon they were thrusting together, staring at each other but focused on the amazing sensations in their groin. Chris forced himself to stop thrusting, gasping, “What am I... what are we doing?”

“No this is good,” Heather protested urgently, pulling his hips against hers. “Daddy was doing this too. He just pulled out and pushed in, and... a... lot,” she moaned as Chris pulled out, then pushed in once.

“...I’m gonna do it more,” he decided, wilfully pulling out and thrusting into her.

“The sliding!” she gasped breathlessly, humping up as he penetrated her vagina again and again. “My girl... place loves how your penis keeps... sliding against it. Sliding sliding sliding oh oh oh oh...”

“I...” he said with regularly shifting hips in the gasping girl, “I love... sliding in there,” he said, hunched over her. In out in out. “My penis loves your... girl place sliding... all around it.”

That was all they said, as they returned to singleminded fucking. They could only think about what was happening with his slick penis pushing in and out of her. They didn’t even notice when the babysitter walked into the room,

and he didn’t say a word, watching the two kids humping on the floor with surprise, but not horror.

Their hips rolling together in a smooth, primal rhythm, the two children stared vaguely at each other, but only thought of what was happening inside Heather. Heather was thinking about how her vagina spread, and stretched, and how Chris’s penis rubbed in and out, wanting to squeeze all around his invading phallus, wanting her vagina full of thrusting penis. She couldn’t think about anything else. Chris was thinking about how his penis slid in there, how hot it was, wanting to penetrate her again and again. And that’s all he could think about, too.

As they gave into their urge to breed, their pleasured gasps rose in pitch, until an overwhelming need to pin Heather down rose in Chris, and he did. Feeling like his groin was singing with pleasure, he came inside his friend. Heather fought to keep thrusting, until she felt a spurt of cum burst into her. Relaxing in surprise, she felt Chris’s dick sort of bucking lightly within her, and every time it did, a rush of hot slimy fluid would fill her. “Oh...” she said in wonder, “Chris, I think you came inside me!”

“It... it did,” Chris said, panting as he hunched over her groin, utterly spent within. “I felt something... pumping out!”

“That must’ve been your cum,” Heather said, fascinated, “That’s what Daddy put into his friend. So now I’m pregnant.”

“Pregnant? Why?” Chris asked uneasily.

“Because... that’s why my daddy’s friend said when he came inside her,” Heathe explained, “She said he was gonna make her pregnant, and he did. So I’m pregnant too, now.”

“What’s pregnant?” Chris asked.

Frowning, Heather said, “I’m not sure, but I think it just means you put... stuff inside me. I-it was really neat by the way. You were just... pumping it in there.”

“Yeah, I... I was.”

“Daddy had to sleep after that,” Heather said, laying alongside Chris as the boy’s softening penis slipped out of her, “But he said they’d do it again on another day.”

“I wanna do it again,” Chris agreed, hugging her happily, “But maybe we can play some video games for now.”

“...I suppose,” she said a little disappointed, “But let me know when you think you wanna do it again, okay?”

“Okay,” he replied, “You wanna play blue team or red team this time?”

Quietly, the babysitter backed out of the room and tip toed away.

until he shouted,

“What the fuck are you kids doing?!”

They froze, or tried to freeze, but their instincts would not be so easily denied. Chris started to thrust in and out of Heather again, if very slowly. Heather looked up from where the horny boy was thrusting in her, saying “We’re um... having sex?” with the most innocent look she could imagine.

“I’ll say,” the babysitter said in shock, sitting back on the couch with a thump, “You’re not worried or anything?”

“A-are we in trouble?” Chris asked anxiously. He thrust in his wonderful friend’s vagina, then pulled out, adding, “S-sorry it’s hard to stop...”

“Oh, don’t stop,” the babysitter said, unzipping his pants, “You’re not in trouble, I was just surprised. So... having sex?”

“Mm-mmhmm,” Chris said with difficulty, his heart racing as he longed to thrust heavily in and out.

“You want him to cum in you?” the babysitter asked the equally tense girl.

“Y-yeah if he can,” Heather said irritably. She wanted to think only about that penis pistoning in her, and this was really distracting.

“I don’t know how to cum,” Chris said worriedly. “H-how do you–?”

“Oh, don’t worry you’ll cum,” the babysitter assured him, wrapping his hands around his own already much larger, growing erection. “Just keep thrusting in and out of her. It’ll fill you up with good feelings, better and better. Then your penis’ll just start cumming all on its own. You’re gonna push deep and—”

He looked at a lust ridden Heather, saying indulgently, “He’s gonna push deep, and fill you with cum.”

“What’s... cum...” she managed to say, as Chris was ignoring the babysitter, and just focusing on fucking her now.

“It’s this hot, slimy goo,” the babysitter said hungrily, “He’s gonna pump it outta his penis, out the pee hole of it as deep inside you as he can get.”

“Oh... ohh...” Heather said deliriously, losing herself in the bubbling urge to mate within her.

“And when he’s done I’m gonna do it too,” the babysitter purred, kneeling at the base of the couch, and stroking his stiff erection. Heather watched in hungry panic, as Chris continued to thrust his penis within her, while the babysitter pointed his much larger penis right at her, saying, “I’m gonna put it in you, and pump my seed out this hole right here, spurt after spurt.”

“Oh oh it... it...!” Chris said urgently, his humping getting shaky.

“I wannit,” Heather murmured, crying out, “Oh Chris you’re gonna make me pregnant!”

“Pregnant?” Chris gasped, halting, “What’s that?”

“I... I dunno,” she said sheepishly, “It’s just what Daddy’s friend said, when he was gonna... cum inside her.” Looking up at the babysitter, she asked, “What’s pregnant?”

“Nothing to worry about,” he said with a devilish smile, “It’s just what they call it when he puts his seed inside you.”

“Oh, well...” Heather said as Chris started thrusting needily again. “Put your... seed inside me!” she declared, humping back against the horny boy, grunting, “Make me pregnant, Chris!”

“I will,” Chris moaned, humping for all he was worth.

“Keep it up, you’re almost there,” the babysitter urged, as the two children eagerly fucked each other, hips rolling together in a smooth, primal rhythm, staring at each other, but only thinking of what was happening inside Heather. Heather was thinking about how her vagina spread, and stretched, and how Chris’s penis rubbed in and out, wanting to squeeze all around his invading phallus. Chris was thinking about how his penis slid in there, how hot it was, wanting to penetrate her again and again.

“Just let it fill you to overflowing,” the babysitter instructed, “Keep thrusting until all of a sudden you have to push as deep as you can. That’s when your seed’s gonna come out.”

Sure enough, after not too much more of it, Chris declared, “It’s so... tingly and ... more, more m—ORE!” and it was like he was struck by lightning. An overwhelming urge filled him to shove deep inside Heather one last time, and he eagerly obeyed. She didn’t even fight to thrust, looking at her groin in anxious anticipation.

“Getting ready to cum?” the babysitter asked, teasingly.

“H-ahhh!” was Chris’s urgent answer, as he started to impregnate his friend. She sucked in a breath, as well, absolutely nothing happened on the outside. But inside her, her friend’s penis was bucking, pumping burst after burst of semen into her.

“It’s warm...” she remarked urgently, “Chris~!”

He sagged atop her, as Heather blinked and added, “Oh it’s... it’s done. Did you feel that?”

“I felt it blasting outta me,” Chris replied passionately, “My penis was... was pumping like all on its own. I wanted it to go into you so bad...”

“Well now I want it to go into her,” the horny babysitter told Chris, “So pull out so I can get my cum in there too.”

“C-chris?” Heather asked, as Chris easily did so, gleaming cock dangling as he did, sitting on his butt next to her, looking very confused with himself.”

“Don’t worry,” the babysitter said, laying his hand on the girl’s shirt right where her breasts would be, “He doesn’t wanna fuck you as much after he’s cum, which is why you need two guys...”

“You... your penis’s much... bigger,” Heather said insecurely, but nevertheless swivvelling to present her groin to him, should he get on top of her and fuck her.

“Don’t worry, I’ll go slow,” the babysitter said, planting his hands on either side of the girl, as his penis dropped down to smack against her pelvis. “With how worked up you are, you should enjoy the... stretching. Tell me if it hurts too bad though.”

“Heather, are you sure...?” Chris said worriedly, but Heather had the older male’s penis wrapped in her young hand, directing it to her groin, incensed as she said,

“I need it. Need a penis in me. He’s pushing against me Chris, he’s... he’s going... in...!”

Heather gave a choked squeak as she was stretched to her limits. It hurt, which was the strange thing, because the more she stretched the more she wanted to stretch. “Oh... so... ungh...” she grunted, as the babysitter eased millimeter by millimeter into her tight pussy. It was too much. It wasn’t the pain, but she was seeing spots it was so overwhelming. “It’s too much,” she whispered, trying to stretch wider to seemingly no avail, “I liked Chris’s penis better...” she whimpered, actual tears coming to her eyes, and she didn’t know why.

“Well you got my penis now, not his, so just... can you... just put up with it?” the babysitter asked, face red from embarassment, “Y-you feel fucking incredible, and I wanna cum inside you!”

Chris held Heather’s hand then, telling her, “It’s okay, just... if you can put up with it, he feels so incredible right now. Cumming in you is the... best feeling in the whole world, and you can give it to him!”

“I’ll try,” Heather whined, squeezing Chris’s hand, and then squeezing it really tightly as the babysitter pushed deeper into her. Bit by bit, he finally bottomed out. He couldn’t get it all into her, but once she felt her vagina resisting on all sides rather than just around his penis, he pulled back, and started slowly thrusting.

That was better, since it didn’t stretch her more, at least. Still she felt like she swallowed a log with her vagina, leaning back and... enduring it more than enjoying it. Why couldn’t he just cum inside her already?

“It’s okay, just...” she said weakly, as the babysitter fucked her so gently but so powerfully, “It doesn’t hurt as much now...”

“Chris,” the babysitter gritted, ignoring Heather’s assurance, “This’s gonna happen to you.”

“What?” Chris said faintly.

“My... my penis just started getting big one day,” the babysitter said, pulling out and pushing in. “It took me over... made me wanna cum inside a girl so bad. Chris your penis’s gonna... grow big when you start... growing up and... H-heather,” he finally acknowledged the girl he was fucking, pushing into her as he said, “Your’s gonna get bigger too.” He pulled out, saying, “You’re gonna love having Chris’s big... penis inside you. And I’m sorry I just... need to put mine into you right now, when you’re...”

The babysitter pulled out entirely then, and Heather lay there in a confused muddle, watching as the babysitter stroked his dick in his hand, using her vaginal fluid as a slick lubricant. “Just gonna... jack off in my hand,” he said distractedly, “And when I’m ready to... cum I’ll push it into you.”

“Oh, okay,” Heather said in surprise and relief, “You can push it into me at the end, it won’t be quite as... big.”

“T-touch yourself too,” the babysitter instructed, jacking off, “Tickle your fucking girl bits, a-and use your finger like a penis. Then you’ll be r-ready when I... impregnate you too.”

So he jacked off, while Heather fondled herself, exploring her own femininity with wonder as she still couldn’t believe it had had the babysitter’s penis in it. She quivered and tingled, and even clenched on her fingers once, and then the babysitter declared, “H-heather, I’m... starting to climax. Gotta... get it... into you. Bigger... bigger...” He desperately pressed the head of his penis against her folds. He groaned as it overtook him, “Wanna cum inside.”

Then she huffed, as her vagina was stretched painfully open again, and had to brace against the ground as the older male pushed his penis in her as hard as he could with a desperate urgency. Then she felt a thick spurt of cum blast against her vaginal walls. Then he bottomed out, and... kept cumming.

Heather watched the babysitter’s penis sticking out of her, as she felt its bursts of cum fill her within. “Wow, there is more,” she said, as it made her feel thick and satisfied and warm to feel her babysitter’s cum painting her womb. “He’s really making me pregnant, Chris.”

“Yeah it... looks pretty incredible,” Chris admitted a little resentfully.

“Hey don’t... worry,” the babysitter said, out of breath as he finished pumping cum into the vagina of the girl he was supposed to be watching. “Your penis’ll get... nice and big, with plenty of cum. Maybe even by the time you turn thirteen.”

“Thirteen?!” Chris said indignantly, “That’s a long way away!”

“Yeah, well... be glad you got Heather here,” the babysitter said, “It sorta happens all at once, like all in a single year for me, if that. But she can show you that...” he gestured at the uncomfortably stuffed girl at the end of his dick, “...this won’t happen. And every time your penis grows, you can show her, and she’ll... be able to take it every time. T-that’s what you can do for him, Heather.”

“I never thought about it before,” she said dazedly, “C-Chris, I’ll... it’ll be kinda cool if your penis starts turning into... this,” she indicated the penis she was on the end of, “Especially if I’m... bigger too.”

“Thanks, Heather,” Chris said, with an awkward hug of her arm with how she was lying there.

“What, no hug for me?” the babysitter said offendedly. Before a blushing Chris could apologize, the babysitter pulled out, and it was surprising to Heather how easy he did so. With his softening dick dangling between his legs, the babysitter said, “Here, you hug her just like you were having sex,” leading Chris to press his groin against Heather’s again, as they hugged belly-to-belly.

“And now I hug... you... both!” the babysitter declared, heaving hard and pulling them both off the floor while they laughed in shock, and he hugged them both on top of him, one in each arm, as Chris and Heather hugged each other in his embrace.