Hypothesis: Foals

by Nauvis

Rating: mature
Tags: My Little Pony: Friendship is Magic, Dark, Porn, Fetish, Rainbow Dash, Sex, Twilight Sparkle
Length: 2984

Twilight does some immoral experimentation. Foals ensue

Twilight was jealous of Shining. Not because of his looks, or his charm, but because of his foal.
She'd always wanted one, in more ways than one.

Contains: Foalcon (like really early foalcon), incest, manual impregnation, an unrealistic recovery period from giving birth, and allusions to inbreeding and futa

Image ID: 1782753

Published 2020-12-06 21:10:00 UTC
Last updated 2020-12-06 21:10:00 UTC

The Experiment

“Twi-, I’m not sure about this..” Rainbow bemoaned, her forehooves crossed in front of her.

Twilight looked at her with what seemed to be hours of exasperation bottled up into one gaze. “Look Rainbow, you’ve already taken the potion. You’re already most of the way there. I can give you some privacy if that’d help, but we need you to finish for the experiment.”

Rainbow threw her hooves into the air, “What experiment!? You’ve been shady about this since the beginning. What scientific good comes from me having to cum in a-”

“Rainbow! Language.” The alicorn tapped her friend with the end of a pen

“Sorry” Though she didn’t sound it for a second, “What good comes from me having to ejaculate into a jar”

Twilight let out a long sigh, a flash of magic pinching the gap between her eyes. “I was asked to do an independent analysis of the virility of alchemical penises. That’s it. Like the briefing you were supposed to read would’ve told you.”

The pegasus’s wings flapped unconsciously, “I did, it’s just…” She paused for a moment, “Nevermind. Sorry Twi, it’s just a bit weird to me is all.”

Twilight smiled back at her friend, “That’s completely fine Rainbow, as I said I can leave to give you some privacy if that helps”

She slowly nodded her head, “Y-yeah, I don’t think I could do it if you were standing there. No offense.”

The alicorn was already on her way out of the room, she turned her head back towards rainbow whose face was bright red. “Just make sure to fill that beaker as high as you can, I’ll be in the next room once you’re done.”

Not waiting for a response, she stepped through the door and closed it. It wasn’t until she took a moment to breathe did she realise that her tail was flagged up almost all the way.

Oh Twilight thought to herself, Well at least she got a show

Twilight pulled the clipboard up into her sight, she crossed an item off the list with a sharp tick. Now all that’s left to do is wait. She absentmindedly looked back over her list

It’d taken a lot of planning. A cover story that wouldn’t get questioned, a participant that wouldn’t brag or squeal, and a friend that trusted her enough to buy it. Rainbow just happened to help all three in one.

She thought back to that morning when she had proposed the idea to her. In person of course, and with a lot of the details in the air. Rainbow had originally been really dismissive about the whole thing. But a few tugs on the right strings had the loyal mare agreeing to meet her at the castle.

Good thing she had, the backup would’ve been way less attractive

Knocking her out of her thoughts, the door to the lab opened behind her. An extremely red in the face Rainbow trotted out, her wings splayed as she walked. They met eyes for just a second before she broke it.

“Everything okay Rainbow?” Twilight asked

Said mare nodded rapidly, the blush on her face still ever present. “Y-yeah, beaker’s on the table Twi. Just like you asked”

Twilight crossed the next item off of her checklist, “Perfect, thank you very much Rainbow. There’s a counter-potion on the table upstairs, after you take it you’re free to go”

She silently nodded before quickly trotting up the staircase, her tail unfortunately glued down tight. Not letting a single peak behind.

Twilight shook her head before heading into the lab herself, she’d only get one shot so she needed to keep her mind clear.

As soon as she entered, she saw the half filled beaker sitting on the side as promised. There were stains along the side of the glass, dripping slowly down to the wooden table it was sat on.

She moved quickly, grabbing the beaker in her magic as she trotted across the room. Semen only had a few short minutes of viable shelf life if exposed to the elements, and she wanted the best shot she could get.

The alicorn grabbed a long pipette out of the drawer, a tool she’d used many times yet never for something like this. One squeeze later, and she had a tool filled with virile cum ready to knock up a mare in heat.

Another reason this couldn’t wait.

Twilight had waited patiently for this, counted the days until her body would be at peak fertility. She didn’t want to leave a single element up to chance.

She levitated the pipette behind her, pressing the cold tip against her outer lips. Biting her lip to keep quiet, she pressed it inside. Not needing a single drop of lube, she was already more than soaked with how close she was to her dream.

Deeper and deeper she pressed the tool, her magic flickering as the waves of pleasure passed over her. After what felt like an eternity, the tip bumped against her most inner seal. The final barrier to knocking herself up.

She took a deep breath, steeling herself for what was to come. Twilight shoved the tool in with her magic. A strong flash of pain struck through her, knocking her magic out for just a second. Her twitching inner walls were the only thing that kept the tool from falling out.

But she had done it, the breeding tool was lodged in her womb. With just one squeeze, she’d be knocked up and all would be good. Her magic fiddled with the bulb, teasing herself for just a second. She slowly increased the pressure, feeling a small trickle of cum drop in.

She’d spend all day like this if she could, the slow cum dripping. Filling her up slowly but surely. A foal of her own sealed to be into this world, more sure with every drop. It was intoxicating.

But sadly, not to be forever. Soon, she felt the plastic bulb press against the other side. Signalling with nothing more that all the liquid inside was now gone. A small sigh left the mare as she slowly pulled the pipette out. She had done it

With the tool fully out, she flew it up to her face to admire it. Aside from the wetness sheening the outside of the tool, there was no proof of what she had just done. Though her flagged tail might tip people off.

She still had work to do, lots in fact. The remaining cum had to be frozen, it’d expire way too fast otherwise. At least this way it had a chance of lasting. She needed to clean up too, the tools and counter’s were stained far too much for a lab of Twilight’s name. No way she could ask spike to help either

She’d be busy, probably for a long while. But she was sure it’d be worth it.

The Results

The castle stood silent, not a single soul in all it’s halls. A peaceful sight for all inside. Though there was only one mare to appreciate it, a single mare enjoying a warm cup of tea and a nice book. The pink mare’s ear flicked as she heard a belaboured breath approach on the other side of the foyer. Starlight looked up as she saw Twilight stagger through the door landing roughly on her side.

Without even getting up, she rolled her eyes and laid down her book. She stared across at the alicorn laid splayed on the sofa she’d moved there about a month back. Twilight had only gotten more and more lethargic as the days went on, any movement was slow and prone to tiring. Starlight was half convinced she was putting on an act.

Twilight pulled off her saddle bags, a small wince every time her hooves touched the ground.

Well, she did say half convinced. “You alright Twi?”

The Princess looked up at her, exhaustion clear as day on her face, “I’m fine Starlight. Just pushed myself a bit hard today. The growing pains were worse today”

Growing pains.., Starlight thought to herself, It’s more than that twilight, why won’t you open up

She’d been complaining about alicorn growth pains for months now. After meeting with Celestia she’d come back saying that her body was growing to match the royal sisters. But Starlight wasn’t convinced. Why now? Why not back when she first transformed? Any attempt at finding out more was met with rebuffs.

A wave of purple magic washed over Twilight’s hooves, slowly pulsing over each one in turn. Another habit she’d picked up…

Starlight sighed and picked her book back up again, she’d been through getting a straight answer out of her. All she wanted to do was get back to relaxing in peace, her mind off of one of her best friend’s actions. She was less than successful.

Twilight picked herself off of the sofa, her hooves now rested enough for her to trek deeper into the castle. She gave a short goodbye to starlight who was deep in her book, and slowly trotted down the hall.

It was a big castle, half the rooms she swore she’d never use. With a short look behind herself, she ducked into one of the side rooms. From the outside it looked like nothing special, exactly how she wanted it. The inside on the other hand was far from normal.

Large beams crossed the room, tools haphazardly thrown around the place, and random garbage littered the room. But none of that captured her attention, she walked with determination towards the hole in the middle. It was a rough hole, the edges clearly hand sawn with chunks of crystal randomly removed.

Twilight slowly stepped down the crude staircase, the spell that she had been holding all day finally dispelling. Her bloated stomach slowly materialising from behind the magical cloak. It wasn’t a hard spell, but it had to be perfect. She couldn’t let it slip for even a moment, or else all would go to waste.

Going deeper through the tunnel, she had to duck on several occasions so as to not bump her horn. She was once again thankful towards the friendship tree, she’d never have been able to do this back in the library. With one more duck she was able to enter into a large cavernous room just as makeshift as the last. This one featuring several beds and cots, an ultrasound scanner, and whatever small decorations she was able to sneak in.

Twilight slowly raised herself onto the bed, pulling the scanner close to her with her magic. She splayed herself out on her back, letting her hooves dangle to her side. With a tiny bit of gel on the tip she pressed the probe against her belly. Eyes locked onto the monitor, she looked over the twin forms of foals slowly shifting around inside of her.

She let the probe fall as a smile crossed her face, she’d never counted her luck as much as she did the day she got the news. She had danced around for joy in the small bathroom she was in, silently swinging her hooves from side to side. And still, nearly 11 months later, she had a hard time believing what that meant.

Twilight brought a hoof up to rub her stomach, the small kicks of her foals slowly smacking against her. Her secret foals, hidden from the world and to be born under a tree. And what they’d do after that… She moved her hoof further down, her folds already slick with arousal.

A squirt of liquid shot out over her hoof.

It took a moment for her to realise what that meant. But once she did she sat up in a fright. 11 months. With her magic she reached for a towel that she kept specifically for this purpose. She felt more liquid begin to squirt, an almost uncomfortable amount spraying over the crystal floor. Twilight moaned in a combination of arousal and pain, as her stomach began deflating outlining the foals inside clearer.

Though it wouldn’t be for long as she began involuntarily contracting. The two foals began flowing achingly slowly through a hole that was normally the size of half of one. Twi’s magic flared involuntarily, casting unformed ether out into the world as she squirmed in pain. She’d tried her best to prepare, but the sheer pain was unlike anything she’d experienced before.

She felt the bulge shift lower and lower, getting closer and closer to the end of the tunnel. Twilight’s eyes were clamped shut as she clenched as many muscles as she could to try and either ease the pain or speed the birth. But it felt like neither worked, despite her best research she was forced to endure.

After what felt like an eternity, she felt the bulge crest daylight. Or at least what counted as daylight. Without the walls of her insides to hold it back, the amniotic sack burst forward to land at the foot of her bed. And like that, there was quiet.

For about a couple seconds.

The sound of a pair of foals screaming broke Twi out of her stupor, rushing forward to pull the newborns out of the bodily sack. A filly and a colt. Pride was the word on her mind as she held her foals close to her, she was a proud mother holding her kin. They’d scream for now, but they’d stop.

Then, the fun would begin.

The Conclusion

Twilight thought she knew how to clean, she felt like she’d done nothing but that since this whole tale started. But nothing could’ve prepared her for cleaning up child birth. It seemed like all the bags, wipes, and towels in the world couldn’t remove the sheer waste she’d made in the past hour.

But anytime she felt her annoyance rise, all she had to do was look at the now sleeping foals sitting in their own cots. She’d done all the hard work, now she’d get to reap all the rewards.

Dropping the towel into the dark bag, she walked over to the fillies cot. She looked the most like her father, a vibrantly red mane with pale blue fur barely growing in. Not just that, she had the tiniest wings sporting from her sides just like Rainbow indeed. She was the definition of innocence as she slept, her tiny head moving up and down softly with her breath.

Twilight smiled and flared up her magic, slowly flipping the filly onto her back. She traced her eyes down the newborn’s body, sizing her up and admiring her creation. At the end of her tiny body, was a similarly small vagina looking barely big enough to fit a toothpick inside.

Twilight traced her magical grasp around the foal hole, pressing what felt like a needle inside to spear the foal open. “Not even a day old, and you’re already spread open. What a little slut you are~” She dirty talked, though it was mostly to herself.

The filly didn’t even stir as she was penetrated by her own mother, the only sign of discomfort being a small hitch in the sleeping breath. She’d grow up to be a real star, Twilight was sure of it.

Looking over at her twin brother, she felt a similar rise in her chest. He was just as tiny as his sister, just without the wings to go with it. Just a dark blue coat, and a dark blue mane.

With a quick flick of magic his sleeping form was upturned the same way, his legs instinctually spread. Unlike his sister, all that was at the base of his crotch was a tiny sheath with the smallest scrotum. “Aww, what a cute little stud you are.” Her magic fondled the skin tight package, “You better grow up nice and big for mommy~”

And grow up was right, they were way too young to do anything too adventurous with yet. Good for eye candy, but if she really wanted to enjoy them she’d need to train them. And that’d never happen with them now.

Still, that didn’t stop her from imagining.

Looking back over at the pair, she pictured them in the heat of passion. One over the other, without a condom in sight. The innocent incestuous pair breeding like rabbits, as it’s the only thing they’d ever known. One knocking the other up, starting the whole cycle all over again.

Twilight was already panting thinking about it, her hoof having shifted to teasing herself without even consciously registering it. All the months of pain and work, all the lies she had to tell. All for the two foals she now had complete control over. Incestuous foal sex, whenever she wanted it.

The filly cracked open an eye, clearly curious as to what her mother was doing. This only added fuel to Twilight’s fire, her hoof moving even faster as the tiny foal stared with beady eyes.

“Yeess~ Watch your kinky mommy cum in front of your foal faces, get your innocence tainted before you’ve even seen the world” She rambled, half gone with ecstasy

It wasn’t long before Twilight crested her own edge, her first orgasm of many in front of her precious foals. A special moment to be remembered for sure, one they would only hear the story of. Twilight looked down at the cots, both of the foals were deep in their own sleep.

Which reminded her of her own tiredness.

It’d been a long day, and frankly she couldn’t care about going back to her proper room. Twilight climbed into the bed she had used for something entirely different not too long ago. Soon sleep began taking her too, a satisfied smile on her face.

There was plenty to do tomorrow, that was for sure.