Peachy Keen sighed in frustration. She’d been looking forward to summer camp so much, as the one time she’d be able to get away from her parents finally, but it was no good. They’d thought of everything.

The thing is, Peachy had a vagina, and she had started touching herself one day, and started thinking about… putting a boy in there. She knew it was wrong, but it felt like she was changing, when she was touching herself. It was just fun at first, but then she started thinking about colts, and wanting colts. Every time she orgasmed, she felt stranger than colts, different from them. It wasn’t just a fillyhood anymore, it was a place for a colt’s penis to slide into. She wasn’t just a foal anymore. She was presenting when she orgasmed, turning her tail aside, ready to be mounted. She couldn’t stop squeezing on that imaginary penis. Her peachy furred hips held a secret now, even just walking around normally, that they were a place for a colt to put his penis in now, and she wanted to feel what it was like when he came inside.

Maybe her parents knew. She hadn’t dared tell them that she’d started secretly wanting a colt to make her pregnant. She imagined her belly getting bigger as she touched herself, and she imagined a whole baby foal just squeezing out of her vagina back there, and it made her moan into her pillow and rub harder. She didn’t even like babies! But to have something growing in her belly, to be forced to give birth, even if she was in the middle of class, to just have to push and push, that turned Peachy Keen on like she couldn’t believe. She didn’t want to hurt herself, but… she wanted a colt’s penis in there. She wanted to let it happen to her. She wanted to feel his semen inside her, changing her, making her pump her blood and… nutrients and all that into her womb, while the foal grew bigger and bigger.

And she couldn’t because there was never a chance to get alone with the few colts she did know. She wasn’t normally even allowed to make friends with them. But Peachy fantasized about a colt coming up to her, who was such a nice guy, and secretly wanted to put a baby in her. She wanted a colt to be like her, to want to change her, to do things with their penis that she could only appreciate vicariously. She had it all planned out. They’d go off somewhere alone, he’d put his penis in her, and she’d stand there eagerly, getting a baby that this mystery colt was putting inside her.

But there was never any chance to be alone with colts. None of the public parks had hiding places, even if she knew a colt. Her room, her parents would find out, or could walk in. And she’d feel so guilty letting them know she was having some colt’s baby. She wanted to keep it secret, and just pretend like she was getting fat, and when the foal was born, Peachy would leave it at an orphanage or something. She knew she wasn’t supposed to get pregnant at her age, but she wanted to just happen to get together with a colt, and she wanted to make a mistake with him.

The summer camp seemed like the perfect opportunity. Away from her parents, surrounded by the wilderness, so many hiding places, but they were required to be escorted on hikes, and otherwise not leave the campground, and colts and fillies were only allowed to meet at lunchtime. She had to sleep with a bunch of other smelly fillies who didn’t have penises, and Peachy didn’t have a penis, and she wanted one.

She was sitting with her friend Sunny at lunch, wishing she could just go over to the colt’s table and have them all just… do what she read about in that secret magazine Peachy had stolen from the adult section of the store. The pictures were all… really muscular stallions just posing and stuff, but the article implied that maybe the mare writing it had gotten ravished by them, and that meant they all put their penis inside her. Then Peachy noticed a colt sitting at a table by himself.

“Sunny,” she whispered, “Who’s that colt over there sitting by himself?”

“Oh, you didn’t hear?” she whispered back, “They say he got a boner in the shower! Everycolt thinks he’s gay now.”

“He got a boner?” Peachy asked in high interest.

“Yeah!” Sunny whispered, “It’s a thing that happens to colts when they’re ready to… mount you.”

“Yeah, his thing has to get really big and stiff, so he can…” Peachy trailed off nervously.

“Do you think he’s gay?” Sunny whispered hopefully, “Or would he do that to a filly, too?”

“You should ask him,” Peachy whispered back, “Maybe he would start doing you!”

“Oh, I could never!” Sunny gasped, red-faced, “I could get in big trouble, and he’d say we’re not supposed to… do that.”

“Are you sure?” Peachy queried skeptically, “Colts are supposed to want fillies. So maybe he’d want to mount you, and… he wouldn’t say we’re not supposed to.”

“I… I…” Sunny replied, hiding her face in her forehooves, “I just think maybe it’s… not a good idea.” She peeked at the colt between her curled forelegs.

“…I’m gonna talk to him,” Peachy said quietly.

“What?” Sunny whispered harshly, “You’re gonna get in trouble!”

“They didn’t say we couldn’t just talk to colts!” Peachy whispered vehemently, “He just looks… lonely, and maybe he needs a… a friend.”

“Well… he is by himself…” Sunny said warily, with a longing stare at the lone colt.

“Don’t worry Sunny, I’ll talk to him,” Peachy said reassuringly, stepping back from the cafeteria table they were eating at, “I know you’re shy about this stuff. If he’s nice, I can… introduce you.”

“Oh gosh,” Sunny said, hiding her blushing face behind her hooves again.

On her way there, Peachy wished she didn’t have to be the brave one. She wished she could tell Sunny how scared she was about this stuff too, but the thrill that this might lead to him mounting her, and putting his boner inside was buoying her on. She couldn’t let a chance like this pass her by.

“…hi,” the colt said, looking up from his lunch to meet her eyes with steely grey ones, “Do I… know you?”

“No, you just seemed a little… lonely,” Peachy said, panicking inside, but she had to get him inside her! “My friend told me what um… happened to you.”

“Yeah, well I’m not gay,” he grumbled, looking at his food again, “It just happens on its own sometimes.”

“What does it feel like?” is what Peachy wanted to ask, but you can’t just ask some stranger what his penis feels like when he gets a boner!

“Oh, s-so you… like fillies,” Peachy said instead. “I didn’t know those things just …did that.”

“I uh… I mean I don’t uh…” the colt blushed red, stammering, “It’s n-nothing weird. Fillies like colts, too. D-do you…?

“Never mind,” he cut himself off, looking down.

“No no it’s okay I know the whole… fillies/colts thing,” Peachy said hastily, “I might have this friend, who… is interested in… talking with colts about that stuff. She just doesn’t know if any colts feel like that about fillies.”

“I… I like talking about that stuff,” he admitted, “I mean… what’s there to talk about, r-right?”

“Well, you uh,” Peachy said uncertainly, squirming her tail against her hindquarters, “You got a… boner in the shower. S-so it just… happens sometimes? Just… comes out on its own?”

“Not… usually,” he said cautiously, “I was thinking about… I-I mean it’s okay if I was thinking about… fillies, right? Not like you, but I just mean fillies in general.”

“N-no I understand,” Peachy said, “I sometimes think about… colts in general. Is that weird?”

“No, it’s just you’re a filly,” he said, “I just don’t know if you’re okay with how I feel about… fillies.”

“I’m okay with it,” Peachy replied anxiously but confidently, “You can even, I mean I sort of like being something you… think about. Do you think about… mounting fillies?”

“…yeah,” he replied softly, “But it might… make her pregnant. I-if I did.”

“Would you do it anyway?” she asked desperately.

He didn’t answer at that.

“I–I think about colts,” Peachy said, “And I… think about how I’d… let him… do that to me. Do you wanna uh… t-try that some time?”

Looking around in alarm, the colt whispered, “Here??”

“No, in your r-room or something,” Peachy whispered blushingly, “It’s a stupid idea I just—”

Before she could apologize herself to death, the colt said, “I have a bunk mate, who… wants to mount fillies too. C-can he do it too? In you, I mean. Oh Celestia, are you really gonna let me put my… my penis in you?”

“Well, when you put it like that umph,” Peachy said, scrunching ashamedly.

“No no I think that’s really cool,” he assured her hastily, “I just can’t imagine, what does it… feel like?”

“…my insides feel empty,” she replied unsure of exactly how to describe it, “My legs start getting stiff, just like if a colt were mounting me, and my tail turns aside, so he can… oh Celestia, do you really wanna put your penis in me? And… and cum inside, and…”

Shivering, Peachy said, “You know my belly’s gonna get… b-big. You want that. I’m just gonna change with your semen inside me. Just… stand there, changing for you.”

“I w-wanna see it,” he said impulsively. At her puzzled look, he said, “When you… give birth, I wanna see it. I wanna make you push a foal out between your legs. Every time I… cum, I want it more.”

“I’ll let you watch,” she said quietly, “If we can find each other. I’ll give it up for adoption, a-after I give birth. But I need your…”

“…Jazz is over there,” the colt indicated with his nose, a grey colt with a jaggy black mane, “He’s my bunkmate. Is it okay if he does um… you, too? He really wants to… do that, even though he’s too shy.”

“I think I know how you feel,” Peachy said honestly, “So he’d… just you know… m-mount up and…”

“I bet he would if he saw us doing it,” the colt murmured gleefully, “So come to my… our cabin tonight, and after I… f-filled you, just… stand there until he can mount up.”

“I can’t believe this is really happening,” the starry eyed filly said, with an unnoticed bit of drool in the corner of her mouth.

“Me neither,” the colt said, “You’re the most awesome filly I’ve ever met!”

“M-me?” Peachy said, looking at him in surprise.

“Yeah, you wanna… you want colts,” he asserted, “Just like I want fillies. That’s… r-really cool. You want penises, just like I want your… your vagina. I h-have a boner right now.”

Peachy’s heart skipped a beat, as she whispered, “You do?”

“You can touch it,” he whispered back, “Just with your hoof. Just so you can feel my penis. It’s stiff and hard a-and I wanna put it in a filly.”

Peachy casually shifted close to him, and nonchalantly reached a forehoof down, finding it curling around a thick meaty cylinder under there. “Oh it’s warm…” she said in amazement, “And soft…”

“It feels hard,” he said tightly, “Can I… touch your fillyhood? J-just with my hoof. I wanna m-mount you right here, but they’d stop us before I…”

“Yeah, we have to do it secret,” Peachy said giddily, “So you can cum in me and I can have your baby.”

“J-just squat down, so that ponies can’t see that I’m… touching you there,” he said in response. Peachy sat her butt down, and soon felt the colt’s hoof prodding her down there.

“Oh, you’re… you’re wet,” he said in wonder, “You want a… penis in you right now.”

“Hehe, yeah,” she said, shifting her pelvis to slide her slick vulva all along his foreleg, leaving a trail of moisture. The urge to pee welled up in her and it just sort of burst out of her in a rush just for a moment. “Oh, m-my… juices,” she lied, shifty eyed, “Just a little… extra juicy.”

“I’m gonna… smell like you all day,” he said in wonder.

She kept rubbing, and… peeing in little squirts, trying not to be obvious about it, having no idea why she was doing it, until she was at risk of sliding her rump all the way above the edge of the table.

“I think that’s… good,” she said, standing up, a little shaky legged from the tingle his fur rubbing against her labia had caused. “S-so tonight, then?”

“After lights out,” the colt specified, “And since you’re doing Jazz, he won’t tell, so you can just come in.”

“Oh, what’s your name?” Peachy asked in realization.

“I’m Transit,” he said. “What’s yours?”

“Peachy Pie.”

“Well?” Sunny asked, when Peachy got back.

“I’ve never wanted to do a colt more in my life,” Peachy moaned in exasperation. “D-did you see what we were doing?”

“…talking?” she asked.

“When I squatted down, that was so he could t-touch me without anypony seeing,” Peachy explained, “He wants it and so does his bunkmate, a-and I’m gonna do them both. Tonight.”

“Tonight?!” she whispered in shock.

“I… I tried to mention you, but I wanted it too bad,” Peachy said shamefully, “I’m gonna g-get two colts inside me tonight.”

“Oh no, it’s okay,” Sunny said in a less than sunny tone, “But with two colts, you’re gonna get pregnant for sure!” Her pupils narrowed slightly, as she looked at Peachy, saying, “When I see you tomorrow, you’re gonna be a… a mommy.”

“I’m… I’m…” Peachy couldn’t help herself, she started rubbing between her legs where everypony could see her. Well, her friend at least. Then Sunny didn’t say anything or protest, just… stood in front of Peachy, blocking the view of others, until Peachy was humping the air in a tail bobbing squeaking orgasm back there.

“Sorry, it’s just…” an exhausted, relieved Peachy Pie said to her friend, “I think I’m a mommy already, I just want it so much. I wish you could… see me being made a mommy.”

“I-I’ll come along,” Sunny Daze said emotionally, “I wanna see them both put semen in you.”

“One of them could do you…?” Peachy said sympathetically.

“No, no they’re both gonna do you,” Sunny insisted vehemently, “I want you d-dripping with colt semen.”

“Squat down,” Peachy said slyly, and as her friend did, Peachy hugged close to her and started surreptitiously rubbing between Sunny’s thighs.

“I… I…” Sunny said in confused rapture, humping slightly on the soft fur of Peachy’s foreleg.

“You can even pee if you want,” Peachy whispered sneakily to her friend. Sunny Daze… squirted.

Everything went perfectly that night, and Peachy might have been having second thoughts, but with Transit’s penis out, she did what her body needed to do, stammering, “M-m-my legs are really stiff I… t-tell me when you’re putting your penis in.”

“You can’t tell?” he murmured into her ear as something thick, hot and meaty pressed against her vulva.

“Ohh boy I can tell,” she declared, as the pressure of his penis against her suddenly increased and Peachy Pie felt herself… open.

“I’m… I can’t stop opening you’re opening me!” Peachy squealed, as she felt something sliding deeper and deeper into an amazing place in her belly. Peachy stretched wide around a boy’s penis, and Peachy oozed her slimy wetness all over him as she accepted him into her vagina.

They mated like idiots, which was amazing. Peachy was about to say something, but the pressure reversed inside her, the penis started sliding out, and her vagina exploded in lusty tingles all over again. Then it pushed in, pulled out, in and out, and Peachy couldn’t stop the mind blowing tingling because he never stopped sliding deep, deep, deep.

So he humped into her, and she braced and rocked back, and Sunny didn’t matter to her, or even the other colt, Jazz. All Peachy cared about was sliding her vagina open around that penis again and again. She went absolutely wild when he flared, eyes popping open, a choked squeal in her throat as she reared up under him which only drove him deeper and fatter and bigger.

“You’re squeezing all around my flare,” he moaned above her, distracting Peachy from looking between her own legs at the mysterious slim belly of hers where a penis inside it was ballooning outward and pressing firmly against her cervix.

Peachy looked back at the colt, pupils narrowing as he met her eyes, with short shallow thrusts mostly just ensconcing his flare even more within her. “I-it’s coming out of… me soon,” he said tensely,

“Oh, I get to see it happen to you,” she said in wonder, as the colt’s forelegs tensed on her thighs. “You’re so beautiful… and big, and uhmn… I love squeezing you. What’s it like to… ejaculate into me?”

“It… keeps getting bigger, and tingling,” he said hastily, “My whole penis, just… flooding into me…” He gasped and flexed strongly within Peachy Pie, saying just, “Bigger… bigger… bigger! Hunh hunh…” he panted only a few times, and then froze, every muscle in his body growing tense against Peachy Pie.

Transit stared at her with narrow pupils, looking almost scared as his whole body tensed, with his penis deep inside Peachy Pie. “You’re putting your semen into me…” the filly said serenely, maybe a bit smugly, then she sucked in a gasp as the penis came alive within her, jerking madly as spurts of a hot fluid warmth started bursting into her, right where his penis was deepest. While Peachy felt semen enter her, she watched Transit’s fear turned into amazement, as he gazed at the filly he was impregnating, panting in short gasps with every hearty spurt that erupted within.

“I can feel it!” Peachy exclaimed in shock, turning forward and declaring, “Sunny, I can feel it! It’s—squirt, squirt, squirt, just like that. Even… deeper than his… huh huhh huhh,” she fell to amazed panting as she stood there feeling that jerking penis within her pumping her full of seed.

Peachy couldn’t believe it, but she was just standing there as she felt the seed entering her that would transform her into a young mother. “I can feel his seed in my womb,” Peachy growled, reveling in the awareness of where deep within her a baby was gonna grow. She wanted more, even as the colt’s spurts fell off, and Transit hadn’t even begun to relax atop Peachy Pie, before she was looking hungrily at his bunkmate Jazz.

…

“Oh Jazz, put your foals in there too~” she cooed as Jazz’s penis started jerking and pumping hot pulses up into her too. “You better cum… oh ooh, more, or Transit’s unh… gonna be the daddy… he’s mixing with you inside me…”

Peachy nuzzled against Sunny when it happened to her. Transit had already tensed behind Sunny, but now Sunny tensed, squealing, “OH it’s—! Transit you’re jerking inside me! Ahh!”

“Feels good, huh?” Peachy asked.

“I… I feel it,” Sunny said dumbly, “I’m just standing here and it keeps pumping into me. …I want it.”

“Right in here, right?” Peachy asked, pressing a hoof right behind Sunny’s belly button.

“Yeah, it’s… f-finishing,” Sunny said distractedly, “M-my womb.” She leaned back and cooed affectionately, “Transit, you made me feel my womb! I’ll grow your foal in there, and I’ll give birth for you too.”

“Don’t count on it,” Peachy corrected Sunny, “Jazz still gets to add his semen to the mix.”

“I’m… I’m a mixing bowl,” Sunny said passionately, “I wanna mix his semen and a thousand colts and… oh Transit, your penis just bursts the semen into me. J-Jazz, you’re really gonna let me f-feel that?”

“I'mma spurt in you so hard, your grandfoals are gonna get pregnant.”

Looking in the mirror, she started seeing her peachy furred hips as a place for colts to be in.

The giggles and coos turned to sighs then huffs, then urgent grunting there in the darkness. She waited, she waited until she was sure he was inside her friend, and they were right in the middle of doing it, then she turned on the lantern, saying, “Aha!”

Peach looked about as guilty as a filly with her tongue in the cookie jar, except that Spring Dream was pretty sure Peach was the cookie jar right now. The orange colt friend of theirs named Apricot was mounted right on Peach Cobbler’s rump, his hips pushed tightly against hers as they both froze in the light.

“I’ve been—” Spring said haltingly, feeling strangely like confessing when she said, “I’ve been listening to you… do this. For the past week. You don’t have to hide it… from me.”

“A-are you okay? With this?” the penetrated filly said with disbelief, “There’s a b-boy in our cabin!”

“He’s in more than just our cabin, Peach,” Spring said soberly, “He’s inside you right now.”

“H-he is,” Peach stuttered as the boy colt Apricot started moving his hips against hers again. “J-just… having sex.”

“Oh man Spring, Peach… feels so good inside,” Apricot said passionately, hugging their mutual friend’s hips as he humped them. “My p-penis is so big and I… I came in her. P-peach, you’re taking me…”

“A-are you pregnant yet?” Spring asked nervously, her own loins acting with need, the more she watched them mate together.

“I… dunno, maybe?” Peach said distractedly, between panting and pushing back against him, “He cums so much Spring. I… I wanna get pregnant.”

With a look of almost panic, Peach Cobbler said, “His penis… making me want it. When a… a penis goes inside your… your vagina, I started wanting it more and more. Oh, Apricot!”

“I… I never did it before,” Spring confessed, “But my vagina’s… making me want it too. Can you… d-do me after her?”

Slowing in his thrusting, Apricot said in a saddened tone, “I… can’t. I can only cum once. I can’t… stop until every drop is in Peach.”

He started thrusting again, while Peach whined, “Spring, Spring, I… wanna see it happen to you. Apricot, please… can you… do her instead?”

“I… I can,” Apricot said, ceasing his alluring thrusting that made Spring feel like she was melting from the tail down. The scent of her friends flooding the cabin was just maddeningly arousing, and now Spring didn’t have to sit in the darkness and touch herself!

“I’m not… pregnant,” Spring said faintly, taking a step back, “Y-you’re just gonna just make me pregnant like, tonight?”

“I’m so… deep in your… friend,” Apricot says, hunched over Peach’s flank. “I have to hold her when I… and push deep, and it just pumps out of me. That’s what I’m gonna… do to you. I wanna make you pregnant too.”

“I… I shouldn’t,” Spring said, wanting it so much, "

“Please, Spring? Just li-lift your tail for him, and we’ll have… we’ll have babies together!”

“S-so all I do is lift my tail and he just…” she looked at Apricot apprehensively, “Puts it in?”

“It’s a lil more complicated than… than that,” Apricot said uncertainly, “But yeah with you, if you… lift your tail, I’ll… cum every drop into you.”

“I… I want it,” Spring groaned needily. She turned and lifted her tail, and presented for him.

“Oh, you’re winking!” Peach said joyfully, “You do want it!”

“I… yeah just, the way he said…” Spring said, looking over her shoulder at the two of them just staring at her rump. “Oh Celestia I’m gonna be a… a mom…”

“…I need to be in you,” Apricot said tensely, still staring. “Not Peach. In you. You’re gonna be so hot, and… wet, and tight.”

“I’m a preview for the real thing,” Peach said giddily, “My vagina’s her… her preview vagina. She’s gonna do… this to you,” Apricot groaned, “And…” Peach started humping back against him, “And this oh oh oh,”

“S-stop, pull off of him,” Spring said agitately, strutting up to her, “I need him, please.”

“I wanna…” Peach said with half lidded eyes, “Make ‘im squirt and putta foal in me. Got a… foal in me. Huhh huhh Huhh…”

Spring outright pulled her friend off of Apricot’s penis, staring as it just emerged gleaming from her friend’s rump. Peach squealed over Spring’s shoulder, then gasped as the penis fell free. “You’re gonna want it, want it… want it,” Peach said hungrily, her tail bobbing with her winking labia. “Soon as he puts it in, you want it more and more. Oh Spring, I wannit so bad.”

“I-it’s okay, just…” Spring hugged her friend, “Just let him just tonight, I just wanna feel it just once, okay?”

“I’ll make you do it,” Peach said in a voice dripping with lust, as she pulled away to jam a hoof between her legs, “I’ll make you do it over and over again until you’re pregnant too. F-fuck her. M-mount Spring Dream. Her vagina needs you.”

“Turn your…” Apricot said, nipping at Spring’s flank enough for her to squeak and shy sideways, “Turn your tail I wanna… wanna do you.”

“O-okay,” Spring said, lifting her tail aside, and turning her butt. He just… climbed on it, just like that. It was easy. Her legs stiffened at his weight, and now she was the one panting. “Your penis is down there,” she said incredulously looking at his mounting as his penis slapped her “Ah!” slapped her belly. Then slid along it, closer and closer to her wetness. “He’s going for my vagina!” she squeaked anxiously, facing forward at her friend.

“He slides it until it—” Peach said when the head of Apricot’s penis just sort of wedged into Spring. “Oh, he’s going in you. I can see you feeling it,” Peach said with slitted eyes.

“I…I… he’s…” Spring grunted intensely as the colt just heaved against her, and—! “It’s… stretching!” she declared, looking back again, “Am I… oh oh ungh…” he started thrusting, rocking deeper and deeper into her with each thrust. She couldn’t think of anything else as she relaxed and faced forward.

“You really wanna foal now, huh?” Peach asked teasingly.

“What?” Spring Dream gasped distractedly.

“A foal,” Peach insisted, “A big belly full of foal. That’s what his penis’s doing to you. Gonna push a foal out of your vagina.”

“Outta my vagina,” she moaned, so full of penis, so needing to do exactly what Peach said as hard as she could.

…

Then he pushed deep, and stopped thrusting! “Why’d you stop?” Spring asked, alarmed with the need to fuck.

“He’s getting ready to cum!” Peach declared, drawing Spring’s attention, “Feel his penis so deep in there, he’s gonna” then his penis started flexing inside Spring, and a blast of something wonderful just pumped into her deep in there. “Ohh, he’s cumming,” Peach said adoringly, as Spring leaned into her stroking in abject confusion, at the strange pulses of seed spreading within her.

“It’s warm,” Spring said distantly.

“You’re a mom now,” Peach said, hugging her close.

It felt like she was inflating in there, and it was swiftly too much. At Spring’s cries of, “Oh! Oh no! It’s!” Peach said,

“Yeah it leaks out of you a little,” as it did. Spring moaned, standing there as slimy seed started to drip down her pelvis and hind legs. “Enough to put a million foals into you.”

“I’m a…” Spring said, lifting her hind leg, looking back at the semen dripping beneath her with a detached sort of satisfaction, “I’m a mom now.”