Twilight's Science Class

“So, you want me to...feed you...until you literally pop?” Twilight asked slowly, making sure she was getting this right.

“Yup! Sure do! I know you’re doing a Science, so, think of it as stress testing an Earth pony, from the inside out! And you can do AJ from the outside in!”

“Huh...that...makes sense...I’m proud of you, Pinkie- not only so open minded, but science minded too! Well, let me clean up, and-”

“And I’ll make the food! It’ll be easier if I do it than you having to buy it or something,”

“That’s very thoughtful, thank you Pinkie-the kitchen is all yours,”

Twilight went to her lab, happily setting up a gyno chair with restraints, so she could see Pinkies stomach the best. She’d be able to measure too! It was a shame she couldn’t weigh as well, but weighing the food first and comparing would be enough. She picked up another notebook, the first one now full of illustrations and science.

She giggled, prancing about, excited about it all. She couldn't help the goo dripping down her thighs, which did shame her...well, if anyone could forgive her for being too excited at something, it was Pinkie.

Pinkie came tumbling down the stairs atop a wave of food. "Okie dokie lokie! I've got all the food, Twilight!"

She climbed into the chair, just as wet as Twilight, and let herself be strapped in. “Okay Pinkie, as you requested, I am going to feed you the sweets you made until you literally burst. Please, keep all remarks to how it makes you feel, okay? It’s important to note that down!”

Pinkie nodded eagerly, her pink head a blur. “Got it, Twilight! I’ll let you know how it feels as you stuff food down me!” she promised.

Twilight started out small, cupcakes with icing, Pinkie eating them happily. Twilight had a feeling that might change, even for the party slut. They got to two dozen, the earth pony still going hard. They hit five dozen and three cakes, and she began to slow down, looking green.

“Urgh...Twilight...feel sick...gonna...but don’t wanna...”

Twilight cast a spell. “There-now you won’t bring anything back up,” Pinkie managed a relieved smile, and they continued.

Three more cakes. Six. Ten. Hay fries by the literal magic ethereal shovel, poured down her throat. Burgers, three at a time, although Twi did eat one or two herself. By now, Pinkie’s stomach was huge, bigger than even a heavily pregnant mare. Twilight rubbed a hoof over it gently, feeling the tension in it as Pinkie whimpered, no longer able to speak with the pressure on her lungs, and on her throat from the bottom.

Twilight levitated a muffin to be the last one, as Pinkie screamed, her stomach tearing suddenly from the sides up. Half digested food blasted out, Twilight bringing up a shield to protect her from the gore and mush. Once the screams were gurgles, she lowered it and trotted to her friend. Pinkie gasped for breath that her squished, flat lungs no longer gave, her eyes unfocused.

Twilight licked her lips. Oh, so wrong...but so hot!

She cast a spell, giving herself a stallion’s equipment under her tail, and mounted the still spread Pinkie. Pinkie managed a smile, glad she’d give one last smile before she’d go. Twilight’s equipment was hard as soon as it came into being, too excited to stay down at all. She unleashed a flurry of thrusts deep into Pinkie’s cum sucker, panting, one hoof against the other’s heart so she’d feel it when she died.

Pinkie, ever the good sport, actually rolled her tunnel up and down the horse cock stuffing her to pleasure Twilight. Twilight snuggled her in response, the mares exchanging an admittedly bloody, sickeningly sweet kiss as they made love. It ended as Pinkie wheezed, eyes rolling back and body seizing. Twilight felt it as the earth pony’s heart stuttered to a halt, Pinkie’s body spasming even harder than it had all evening. Twilight blew a load into her cunt, the cum splattering out the torn womb and over her exploded insides.

Twilight didn’t even rest before ramming her cock into Pinkie’s dead tail hole, now committing necrophilia. She didn’t care, it felt so good! She suddenly understood how others became evil, giving in to their urges. Not as extreme as this...maybe Nightmare was, but it hardly mattered. All that mattered to her right now, and forever more, was her science and how hot it made her. She was sad she’d cremated Fluttershy before she could feel her dead holes, but Rainbow was on the list, and she still had Rarity to mount.

She at least had enough presence of mind to write down how an earth pony’s body felt during, and after death-she made sure to be detailed about movements and feeling. This was science, after all, she had to be thorough so she could replicate it later on! For...proper testing, of course.

She blew another load up the dead plot, joining the rest of her cum in the soup. She panted, laying on Pinkie’s body. She wasn’t used to so much exercise...speaking of. She levitated her book to her. She was eager to see how Rainbow Dash compared to Fluttershy, and had just the idea to get her to the lab. ...after cleaning, of course.

Cleaning...she looked around her, ear going flat. By Celestia...had she really done this? To her friends, for science, maybe but killing them...and the afterwards...pleasuring herself with cold, sticky corpse holes... Pinkie had been happy to do it. Fluttershy an accident...but Rarity! Dying in such a way...in so much pain...b-but the data on the pain! She began trotting back and forth, her usual nervous tick. M-maybe a painkiller? Less painful experiments?

She shivered, before collapsing and puking in the mess already there. She spat, heaving great sobs as she began to cry. Scared...she was so scared. Because of what she'd done...and knowing she'd do more. She wanted to, as much as she didn't. There was no going back...she got up, unsteady. She'd keep going...if nothing else, she'd finish her work. She had to. It couldn't be all for nothing.