Twilight's Science Class

Twilight sent invites to Big mac, and all three of Pinkies visiting sisters. She had her special science room cleaned and prepped, taking no chances, especially when it came to Maud. She might be the most powerful non alicorn in the land...maybe more powerful physically than any alicorn. Which is why the lab was stocked with potions, spells, and horn repair items...just in case.

She went through her notes, reading up on her science, one hoof gently rubbing at her purple princess pussy as she reminisced, waiting for her guests. She knew who she'd start with, working her way up... with an excited if worried smile, she licked her hoof clean, gave Spike the day off, and hurried to the front door, timing so she got there at the first, heavy knock. Ah, Big Mac! Punctual stallion.

"Hiya Mac! Refreshments just in that room there, go have some while I greet other guests!" he nodded, "Eeyup," and trotted off to the room, a table laden with snacks and bubbly drinks that hid their spiked nature. Twilight left the door open, as the Pie sisters arrived. "Welcome! Pinkie had to run to the store, but come have a drink while we wait!"

Maud peered at her, "Pinkie. Forgot something for a party." "Ah, well, no...it's...embarrassing but um, she went to get me some...private time things," she flushed, the excuse accepted-a party pony like Pinkie had all sorts of 'private time' things, and less shame to buy them for others.

Limestone strutted in, "Well, don't expect me to be on the bottom, if it's THAT kind of Pinkie Party!" "Heheheh, it's not-but I'll remember," she assured her now dead friend's sister. She led them to the party room, Big Mac nodding to them, and blushing when he saw Marble, who returned it.

They sat at their places, each with a place card. This was needed-Maud's spiked drink was much stronger than even Big Mac's, no chances taken in this. Twilight picked up her glass. "Let's have a quick toast, to having, and making, great friends!" Everyone toasted, and drank all their juice when Twilight sculled hers, even Limestone not wanting to offend both a princess and one of her sister's best friends. As the drug began to work, they chatted and snacked, until the Pie sisters and Mac began to yawn.

"Ah, it must have been a long trip, huh girls? And Mac, you must be so tired, taking on AJ's chores as well while she's on a map mission! Tell you what, i have lots of rooms-you can all take a nap, and girls, I'll let you know when Pinkie comes back," she promised, no one seeing anything wrong with the Friendship Princess' hospitality. She led the Pies to a room with a large bed. "I thought you'd all be more comfortable together," she smiled, shifting from hoof to hoof, no one questioning a princess well know for anxiety for being somewhat anxious at a gathering.

They seemed to agree, plodding tiredly to the bed, Limestone first and laying on her side, then Marble laying on her tummy, and finally Maud laying on her back. She took the time to take Boulder and place him on the nightstand before falling asleep. Twilight nodded, levitating a potion to Maud, carefully tipping it so she swallowed it slowly, emptying it entirely.

Big Mac swayed in the hall, paying no attention to his host, until she trotted up to him. "Alright Mac!" she cast a spell, in fact multiple ones. To make him alert, unbearably horny, and completely loyal to her and willing to do anything she asked. That had been the hard part-making it look like she just HAPPENED to come across those spells, not looking for them specifically. "Science time!" she cast a spell, teleporting her, Marble, and Mac to the sciencing room.

She cast a spell to nullify the potion and wake up the almost mute pony. Marble woke up slowly, looking around, confused but not alarmed at the clean, sterile room...well, clean and sterile for now. She might be more upset if she knew Twilight's next experiment.

"Hi Marble! Now, I know you must be confused!" Twilight said, leaning down so they were muzzle to muzzle. "That's okay! See, I'm doing experiments on ponies to fill out books on anatomy! They're hard to find and get, especially in depth ones! Speaking of in depth, Big Mac here is assisting me! We're going to stress test your insides!" she explained, Marble's blush at Mac turning to confusion again.

Mac lumbered over, a bit stiffly under Twilight's control, and flipped Marble onto her back, getting between her hind legs. Marble's eyes widened in fear as she realized what the princess meant, Mac's prodigious erection spilling up her soft belly. She shook her head, whimpering, pleading with her eyes. Twilight did look a bit reluctant, but she'd already gone too far. She'd finish it, if it was the last thing she did...and it might be. She magically gifted herself with a shaft, working it with her hooves and dragging over a round burlap sack.

Marble sobbed, trying to wriggle out from the stallion, failing as he pulled her back, tip pressing against her hot little pussy. Twilight spoke, "If what Pinkie says when wasted, she won't have a hymen for you to pop-she liked to throw dildo parties with her sisters. A shame they didn't have a brother-incest would be an interesting experiment, but..."

She up ended the bag, Pinkies head and then AJ's bouncing slightly on the floor. "I kind of took care of both of your sisters already. But that's okay! If I really want incest, I have a brother myself!" Marble wailed at Pinkie's head, reaching for it. Twilight gave it to her, Marble sobbing and cradling it. "See? I'm no monster!" she said, trying to convince herself as much as Marble.

Marble screamed as Big Mac thrust, so big and long he was striking her cervix in the first thrust. Marble reached a hoof to Twilight, "Don't...have to..." "Oh I know! I've got so much data on earth ponies, this is really just for fun! Know what would be more fun?" Marble sobbed, sure she knew where this was going.

Sure enough, Twilight teleported Limestone into the room, waking her up. She saw Marble, and screamed in rage, rushing Big Mac who just kicked her away with a hoof. Her nose broke, and she slid along the floor on her side, groaning at the pain thumping through her face. Twilight sighed, before tugging Pinkie's head to Limestone, who screamed again, pouncing for it, Twilight pulling it away so she ran face first into a wall in her rage.

She staggered, landing on her belly, Twilight moving AJ away before approaching her. Her magicock was as hard as her pussy was wet, the guilty churning in her stomach seemingly only making her more aroused.

Limestone snarled, "That nasty thing comes near me, I bite it off!" "Hm, that would be an issue! I can fix it," Twilight assured her, her magic forcing open the rock pony's muzzle and practically scooping out her teeth, one by one. Limestone struggled, glaring, but refusing to sob, barely even tearing up because of the pain. Twilight thought it had barely hurt since Limestone had barely reacted, feeling good about that, at least. Until Limestone's front hoof lashed out at her, only the earth pony's dizziness from the wall hit saving the alicorn.

Twilight sighed, before her magic crushed the joints of Limestone's legs, front and back. "I know how strong Pie legs are...I won't risk it with you," she said, stroking her hair as Limestone gasped, trying to work through the pain...it wasn't easy, so much all at once. "I know it hurts...but I need the data on that. It's okay, be as loud as you need-the lab is sound proof."

Marble wailed, reaching for Limestone, sobbing. Twilight came over instead, Marble tucking her legs in again, whimpering, not wanting whatever much worse fate the princess could think up. She'd prefer the rape, no matter how physically and mentally painful it was. Twilight took Pinkies' head, lowering it to Marble. "And you? You'll kiss her, won't you? Don't make her feel unloved like your sister did, I'd have to punish you..." Twilight wasn't sure if she could hurt someone to punish them, but Marble didn't know that.

Marble whimpered, "Mh hm..." and leaned up, smooching her sister's dead face, trying not to hurl or flinch at the cold flesh pressed to her. "Don't worry! I preserved her, she'll be pretty for years, I promise," that just made Marble sob in emotional pain. She kissed deeply, terrified of this crazed pony, and hoping her exit from life would be fast, if it couldn't be painless. Twilight smiled, "Time to begin our experiment..."

She sent a bolt of magic at Big Mac, making him spasm, before he whinnied, cumming in Marble. "That's gonna make him cum a lot of times! I want to see how much it takes to pop you from the inside..." she dragged Limestone over in her magic, sitting on the earth pony's muzzle. "Lick me out, please. I know you're not much of a bottom, but I've used my cock so many times already!" Limestone glared, before lapping deep in the murderous snatch, rubbing muzzle about the silky labia. She didn't want to admit it, but princess pussy was pretty fucking good.

"Ooooh, you are good at this..." she rubbed harder against the mare's face, before creaming on it, panting, "Oh jeez...sorry about the hair trigger, science gets me going," she admitted, lifting her rump so Limestone could sputter and gasp for breath. She turned, grabbing and jerking off with Pinkie's head, before cumming through it onto Limestone's face. She gritted her teeth, trying hard not to cry at the blatant disrespect of her sisters corpse.

"M-maud won't stand for this!" "Maud is drugged harder than all of you...she won't wake up until I wake her. And we're too far down for her to hear you-I made sure of it, then went deeper, just in case." she yanked the head off her cock, letting it bounce onto Limestone's tummy. "But I'll warm you up for Mac,"

"I'm a lesbian! I'm not bi!" "Oh, sweetie...you're a science toy now. That he's going to help me experiment on, to learn more about the body...and fun, of course! It doesn't matter who the cock is attached to, once you're a corpse cock cushion!" she began to argue again, trying make Limestone see the same sense she did, as Marble screamed, body bloating.

"Ah! He must have big loads, almost time!" she said, moving between Limestone's legs and slipping in her dry, chaffing pussy. She pulled out with a cluck of her tongue, before using her own sperm to lube up and slid back in. "Wah-no! I don't want a foal!" "Doesn't matter if you're dead, although keeping you as a fuck pillow does sound tempting...I've always wondered if Cadance and Flurry are outliers, or the rule...maybe another." she said, now pumping in and out of the grunting earth pony, watching Mac unload cum every few minutes.

Marble had her hands on her tum, like she thought she could hold it all in as her womb expanded painfully. Soon, fatally. Twilight licked her lips, moving deeper. She adjusted, before ripping through the earth pony's cervix to her womb, raping her from start to end with deep moans.

Mac wrapped his hooves around Marbles hips, and shoved, the last jet of cum and the thrusting causing her skin to rip, making her wail as cum and blood oozed from the rips and tears. "Ngn...thought it would be more of an explosion...see...this is why...we need better science!" Twi gasped, cumming in Limestone's womb. The broken pony just cried silently, staring at her dying sister, knowing another was dead, she was next, and even Maud couldn't fight this crazy bitch.

Twilight pulled out, getting Mac to do the same, which made the cumming stop. She walked to the sobbing Marble, and gave her Pinkie's head. "Here, some comfort..." she said, marble taking it and making out with the corpse head. She was racked with pain, doing the only thing that could bring some comfort. Twilight let her die in peace, owing it to her best friend to let this one have it. Marble breathed her last while tonguing Pinkie's limp one, eyes going blank. Twilight nodded, satisfied, before turning the fresh corpse on its stomach and mounting up, violently raping her asshole.

"Fuck, this is good...too bad I couldn't feel her deathgasm....as Pinkies sisters, you're all very special beyond just the science!" she grinned. "Speaking of...Big mac. Take Limestone up the ass, as violent as you can...let's see how much damage she can take," she looked apologetic, "If it hurts too much, I can numb you," unaware that Limestone could never, too prideful to ask that of anyone, let alone her sisters' crazed killer.

Limestone gritted her teeth, and held down her bile. It was going to be a rough night.