Equestria's Finest Hour

Twilight had had a secret lab in her treehouse before, but the lab in her palace was both better equipped and more secret. The Tree had obviously known what she wanted, because it was complete with holding cells, a myriad of supplies, scientific tools and machines, and even restraints and sexy toys, some of which were fitted specifically for foals.

The library attached to the lab was filled with books on dark magic and forbidden technology that she couldn’t keep in her primary lab. It had a lot of sex books too, one of her favorites being a kama sutra specifically for 'age-difference relationships'. That one and others that didn’t mention dark magic were moved to the main library though, as she wanted ponies to be able to check them out. She kept the foal-fucking sutra open at the front of the library, hoping to influence ponies that came visiting.

Twilight took Applejack’s foals down to the lab, immediately pulling together all the she would need. She was itching to turn the innocent cuties into toys for her research and pleasure, so planned to have them hyped up on growth hormones and magic for their entire stay, which would be their whole lives most likely. They would never even know about the world outside her lab; they would only know each other and Twilight, and maybe Fluttershy if Twilight invited her over, as Twilight enjoyed bonding with Fluttershy as a fellow foalophile.

But for now she had science to do! She only had one incubator prepared, having only expected one infant, but she had spares for all the parts, so putting together a second wasn’t difficult. She started with Filly-1, placing her on a minimally comfortable mat, taking a moment to admire her little body.

She was so deliciously underage, not to mention still blood covered. Twilight ran her tongue over her belly, then down to her slit, tasting Applejack’s drying blood. The thought of her own treachery, having murdered one that trusted her and left them to rot, was drenching her pussy. Twilight decided that betrayal was her second favorite fetish, and was tempted to move on to her other friends, maybe turning on Fluttershy at their next session. Killing too many of them would make it too hard to keep Twilight’s activities secret, however, so she’d wait for a more appropriate opening when the death of another friend would have scientific value.

“Spike, I need to pee,” Twilight called back to Spike as she gave the filly one more lick, then began to clean the rest of the blood off with her magic, smiling at how fluffy the little science-toy was.

“Ugh,” Spike sighed, but padded over all the same. Twilight often did this when she didn’t feel like stopping for a bathroom break during an experiment. He moved around beneath the bed she was at, grasping her flanks and pushing his muzzle against her pussy, cupping over her whole vulva. He tried not to make too disgusted of a face as he tasted the trickle as she released, urine flowing from her urethra, dutifully guzzled by her dragon slave.

“Tongue,” Twilight smacked Spike’s head roughly with a hoof, since that should be understood. Meanwhile she worked on Filly-1, placing a breathing mask over her face, which would keep her sedated enough not to try and crawl off, as well as feed her. What she’d be fed with looked like pink slime, and was disgusting to be sure, but it would ensure that she grew quickly. She would need to prepare more of that since she had an extra prisoner.

Another tube that covered her little slit and asshole, ready to suck away any mess that she made, after Twilight gave it another lick. She then placed a helmet around the infant’s cranium, which would give her a crash course in all the education she needed, which was basically how to talk and nothing else. All she needed to be able to do was follow directions. Sex ed wasn’t included of course, since Twilight wanted to do that hooves on.

“I am going to fuck you so hard,” grinned Twilight, kissing Filly-1’s forehead once more, “And so is your brother.” She moved a hoof to Spike’s head then, gyrating her hips against his muzzle, “You’re such a good toilet Spike.”

Meanwhile, Spike tried his best to do as said. He rolled his ridiculously long tongue into his mistress’s slit, parting her lips even as he continued to guzzle her piss, twisting about inside her, able to go so deep that he could actually lap at her cervix. It’d been a long time since she let Spike put anything but his tongue in there; sometimes he wondered if she was experimenting on him by getting him as pent-up as possible around her. Or perhaps he was just getting too old for her to be as interested in him; he was thirteen now after all.

Twilight moved on to the colt, grinning as she held him up and slurped about his shaft. Even now his cute little pecker stiffened a bit as her tongue batted it around and lips pulled back his tiny sheath. She couldn’t wait to feel him inside her; the fact that he was so young would be well worth the lack-of-tightness.

She attached him to the machines as well, settling him in for his forced growing. The magical goop he would be fed was laced with painkillers, but she only did that to keep them from breaking completely before she could play with them. It would still be excruciating for their little bodies as they grew, and Twilight shivered just imagining their screams. She’d have to sleep on a cot down in the lab so she could fall asleep to the sweet sound of their tears.

With any luck, the excruciating process would get them up to breeding age within a few months, with their bodies being about five years old, the same age that Twilight was when she lost her virginity to Shining at his eighth birthday party. She still remembered getting her face shoved into his cake as he raped her, to the encouragement of their parents. Such heart-warming memories. Now that Fluttershy had gotten her into foals as well, she could appreciate her foalhood all the more.

“Oh, yes,” Twilight moaned, finishing her urination only to blow another blast of cunt honey into Spike’s face, which he lapped up obediently as well. She shivered at the feeling of his tongue washing the insides of her tunnel, then finally letting him come up for air. She smirked down at him, “What’s with the face like you think it’s gross? Net times make a nicer face or I’ll rape your faggot ass again.”

“Understood,” Spike sighed.