Twilight's experiments

by Twilight Scientist

Rating: mature
Tags: Sex, Twilight Sparkle, My Little Pony: Friendship is Magic, Dark, Rarity
Length: 3383

Twilight needs the help for carrying some experiments. Also she invites Rarity to help her. Rarity doesn't guess what fate waits for her.

Twilight needs the help for carrying some experiments. Also she invites Rarity to help her. Rarity doesn't guess what fate waits for her.
Warning content: rape, cum inflation, impregnation, rapid pregnancy, birth, futaTwilight.

Picture by animalcrackersinmysoup on http://www.furaffinity.net/
He offering 10$ stuffing/weight gain kink sketches just like this one.

Published 2015-08-07 19:00:01 UTC
Last updated 2015-08-07 19:00:01 UTC

The First

Twilight has leaned out from a library window, and painfully blinked her eyes. Time approached by noon. The sun has frightened off the sweated ponies in a shadow and closer to cafe with ice-cream. Sighing, the unicorn cast some more protective spells. Today should pass one of those experiments to which nobody should prevent. The unicorn trembled in excitement, literally dancing on tips of hoofs. She always adored magic experiences. After all what can be finer than new knowledge?

Faster, Faster! Nothing can be forgotten! Twilight removed the whole pack of books from the shelf, pulling out pair of imperceptible volumes from the depth. The shiver of impatience ran on her skin when the unicorn opened the book on the necessary page, looked through one more time, verifying with the experiment plan. Magic! Magic! Forbidden magic!

Someone knocked on the door.

Twilight fast trotted down the stairs, opening a door. There was Rarity on a threshold. Marshmallow mare with surprise examined spells from which external walls of library were literally shone.

“Twilight?” she asked with astonishment. “I didn't prevent to you?”

“No, no! That you! I asked, that you came!” the violet unicorn dragged her friend inside, slamming a door.

“And where is Spike?” Rarity took an interest.

“He is in Canterlot on my assignment. Actually, your help is also necessary for this reason. While he isn't here, I want to carry out a series of experiments!” unicorn’s eyes burned with live fire. Rarity sighed then noticed familiar sparkles in her friend’s stare. She considered Twilight`s similar view slightly insane.

“You are sure, what I can help to you?”

“I’m sure! I need one more unicorn! And you, as one of my most talented acquaintances, will help as well as possible!”

“I will try.” Rarity confusedly smiled.

“Remarkably! I will prepare everything now, and you could go to the kitchen to make tea. I hadn't breakfast today yet.

While Celestia's best student with might and main rumbled with any equipment, Rarity has made tea, pouring out it to cups.

“Twilight, tea is ready!” she shouted.

“Yes, one minutes more! You may take cookies on the table! I will approach soon!”

Rarity opened jar, having got a couple of cookies bought in the Sugar Cube Corner.

“My favorite, thanks!” The unicorn nodded, sending a batch in a mouth.

* * *

The consciousness came back slowly, as after a deep sleep. Rarity drowsily yawned, opened her eyes, without understanding, where she is. It was the same Twilight library. But, how she could fall asleep here?

Rarity moved, realizing abnormality of situation. Her body was fixed on a strange design. The unicorn lay on her back, her legs were densely clamped and moved apart baring her soft lower lips.

“Hey, Twilight!” Rarity nervously shouted. “What going on?”

“Hey!” Lavender unicorn was put out behind table with retorts, levitating one of books. “It’s for your benefit. I didn't want, that you did much harm to yourself or me if something goes wrong.”

Rarity hiccupped nervously:

“Twilight, I don't know what occurs, but you mast release me immediately, or I will shout.”

“Well, it is possible to shout. According to the plan, shout will not bring any errors in a course of the experiments,” thoughtfully told Twilight being verified with the book. “I just in case cast sound insulation on library that nobody disturbed us.”

“Twilight, please!” Rarity was nervous, trying to find something that will help her to be released. She did not want to do much harm to her friend.

“Oh!” Twie suddenly bethought. “Almost forgot!”

The unicorn got a clothespin on a wire and attached it on a tip of a horn of marshmallow pony.

Rarity tried to create a spell, but the only thing that managed to achieve - an easy luminescence round the standing nearby metal block.

“I earthed magic a little,” Twie explained. “There is a lot of valuable equipment, you understand. I don't want, that we will suffered…”

“If something goes wrong,” finished Rarity. “Twilight! Think again! I don't know, what your experiment consists, and I do not want to know! But, think once again! We are friends!”

“Of course we are friends,” unicorn agreed. “Therefore I ask you to help, as my friend, as unicorn and as generosity element! You don't understand what it is! To read about different things and have not possibility do some experiments, do everything that described in books! Make experiments and to see result it is simple ecstasy! You should feel something when are engaged in favorite business!”

“I don't kidnap pones for this!” Rarity was indignant.

“You held Rainbow Dash once, dressed up her in all your dress and wigs. For her it was equivalent of torture. You forced me to work by model against will many times too,” reproachfully threatened with a hoof Twie. “Now is your turn. That’s all, now don't disturb. It is necessary to concentrate for me.”

Twie got a small vials in which managed to drop some liquid. All of them were different colors. Put three flasks on a table, unicorn started to cast on them any difficult spells taken from book.

“Twilight,” Rarity asked scarily, “is this big symbol on a cover doesn't mean, what unicorns are forbidden to practice spells from this book? Where you took it?”

Twilight ignored a question, having completely concentrated on a spell. Taken one of flasks, she approached to the friend and put a neck in her mouth. Rarity shake up the head, but Twilight held friend’s a nose, and overturned a bottle.

The mare of fashion was compelled to swallow viscous greenish liquid which appeared absolutely tasteless.

Strange heat spread on her body. The unicorn opened eyes, having felt a strange shivers.

"Well done. Are you ready?” Twilight leaned on a table, rising by hind legs, and carried out her hoof on friend’s belly, tousling white fur. Rarity heatedly swallowed, having felt moisture between hind legs. What the hay? Why she was so aroused? That’s just Twilight. Really … No… Rarity once again looked at the mare. She didn't look somehow differently. Attractive or sexual. But, the body without the reasons was more and more aroused... What the hay?

"It seems that worked!” Twilight began to jump in pleased!

"You made it?” Rarity exhaled.

"Certainly! I didn't want, that experiment came to nothing after all! I have only one day! It is necessary to manage to make all planned experiments.”

Twilight pulled out the whole pile of bottles from a box, got a pen and personal diary, began small and quickly scribbles in it.

"The first stage passed successfully. We pass to the second part!” the unicorn literally screamed, hopping. She picked up violet bottle with telekinesis and drank it at a gulp.

"Ukhukhukhukh…” Unicorn began to tremble, giggling. Approached to Rarity, Twilight crossed forward hoofs through white unicorn’s hind legs, and inclined a muzzle to the friend’s muzzle. “, Rarity, I am glad that at last I will try about what I read very much. Now I will understand that isn't let know to many mares!”

Rarity has squinted eyes, having seen that Twilight gets on a table and with hind legs. Huge thick phallus rocked between them. It was pulsating gently, but rapidly, and growing with each pulsation. Twilight’s horn glowed and her cock extended once more to be nearly tree feet in length.

"No, Twilight...” Rarity whispered in mistrust. “No, you won't dare!”

But, in Twie's eyes she was read only determination and enthusiasm sparks.

"I will shout,” the white unicorn warned once again. But, instead of the answer, has felt as something wet ant hotly touch her pussy.

Rarity has emitted a whistle.

"Silence,” Twilight whispered, covering Rarity's lips with her own. Rarity has felt as unicorn's tongue penetrating into her throat. Eyes have scaredly extended, and the excitation wave has swept on her body. Along with it, Twie has moved hips, getting into her the friend. Rarity felt how unreasonably big phallus tears her virginity, slowly increasing the tension in her body as her pleasure built up. Twilight's phallus would more suit a Big Mac, than a fragile unicorn.

But, it didn't confuse Twilight. She has rolled up eyes and has licked lips, and kiss Rarity once more before next protested cry has left fashion pony’s mouth.

Twilight continued humping Rarity's pussy each time getting deeper and deeper.

Marshmallow pony gagged audibly letting a squeal escape her with every stroke. Rarity felt how her friend’s penis slide up and down the line of her vagina.

Everything rending inside her, because Twilight's stallionhood was too large for white mare. But excited moans of pleasure escaped his lips one after another. New stallion bring her to new level of gratification.

What the hay! She thinks about Twilight as a stallion! What is going on? This is her friend! But, the body betrayed her being more and more arousal. Rarity were raped by her friend. Everything burned inside her, but the body repeated that this pain bringing her to new heights of pleasure, and Rarity could only damn herself for it. Sparks poured from her horn, continuing to be grounded on a metal pig.

At last, at pleasure peak when Rarity's brain already poorly perceived the events, everything has stopped. Rarity has realized that lies under Twilight. Her tongue thrown out, her eyes having rolled up, and all her body shiver waiting for long-awaited ecstasy.

Rarity has looked at the friend, but Twilight has only smiled, having put front hoof to a unicorn on a chest. Also has walked to a tummy, massing skin.

"She probed her member!" Rarity has realized. Twilight's flesh has pierced her, it seemed, to the thorax. Such hot and live...

"What if I will become pregnant?" the panic thought has rushed. "No, I need to get out!"

But, Twilight, allegedly, has read her friend's thoughts, in some movements returning the excited body on pleasure peak. Rarity has understood that nothing will stop an orgasm wave this time. It has rolled as if a tsunami, overflowing a pony from hoofs to ears. Rarity has felt Twilight's shivers, overthrowing in her bosom a stream of a warm seed. All thoughts in Rarity’s head have mixed up. No! It can't be!

But, it was.

Rarity twitched as she felt the cum expand her womb, bulging it outward in an attempt to make room for Twilight`s immense orgasm. Under endless stream her womb bloating more and more. Naked skin cover with stretch marks showed through white fur. She felt her tummy tighter and tighter. She thought her belly was ready to burst in every second when Twilight has pulled out her new member at last and has breathed sigh of relief.

Rarity breath has filched, she tried to restore it. And the violet unicorn already scribbled in the notebook, getting the next bottle.

Twilight heaved a deep sigh and drunk the next magic potion. This time she has approached to Rarity slowly as if something disturbed her.

"The second Experiment!” the unicorn has murmured, rising by a table again.

This time Rarity has noticed that Twilight's balls were inflated to the improbable sizes. The unicorn has been forced to move apart hind legs somehow to move.

"Relax, Rarity,» Twie has advised. "Strength will be necessary for you today.»

With these words Twilight pouring in the next magic wish-wash into Rarity's mouth and began humping Rarity under a tail.

The unicorn sighed. She felt how Twilight moves ahead on a rectum, and it was absolutely other type of pleasure. And pain. Suddenly, Twie has gritted teeth and has begun to tremble, working hips as quickly as she can. Before Rarity could reach pleasure, the wave of sperm has rushed into fashion mare's guts.

The stomach hummed in the protest, but the powerful stream of sperm filled it, moving through the intestine.

The stomach was painfully bloated, and Twilight has touched it by a hoof.

The flesh-coloured dome covered with a white fur was stirred up, causing unpleasant tension. Rarity felt how liquid gurgles inside.

Eructation has escaped from her mouth. Rarity tried to tell something, but has hardly constrained an emetic desire.

Half-minute later the emetic spasm has overthrown a stream of sticky white liquid from white unicorn’s a throat. Rarity has had a fit of coughing, having choked with seeds that has caused only a series of new emetic desires.

Suddenly Twilight has bent, dropping to her friend's lips and has begun to drink own seed greedy. Rarity has goggled, trying to catch breath between vomiting and kisses. This proceeded until Twilight fully hiccupped, having leaned back and stroking a hoof on her bloated paunch. She licked her cum-covered muzzle.

The last portion of seed Rarity has vomited, having turned the head on one side.

White unicorn has become stupid stared at her friend, whose stomach was inflated almost also, as her own. Twilight drank own seed passed through her intestines in the unnatural direction.

"Forgive me, Rare,” Twilight has smiled guilty. “I was diverted. I am truly hadn't breakfast today, are you understand?”

"Will you forgive me?” Twilight has bent down, having pulled hard her stomach on her friend's belly. The top looked ready to burst when how big her belly is squeezed. Than has caused only a stomach contents flow from white unicorn's a mouth and pussy.

"Oh, Rarity, it is necessary don't do this. You need each drop. It is very nutritious” the unicorn has instructively told.

She has taken the member from her friend's anus, and passed a table, stumbling hind legs about own eggs. Then, having bent and pressed lips to Rarity's lips, having at the same time pulled hard a stomach on the table edge. Twilight’s vomit rushed into white unicorn’s mouth. Rarity has hiccupped having swallowed the first some portions. The seed has gone a nose and Twilight has departed back.

"I think, there is enough on the first time,” she has told at last.

Rarity looked very miserable. With the bloated belly and her friend's the natural liquids spread on her beautiful fur and drip out from all holes. Tears ran from fashion mare's eyes. She couldn't either speak or shout any more, without risk to empty her stomach directly on herself chest. Besides intestines demanded, that it is necessary to be emptied immediately. But, Rarity has only persistently squeezed a sphincter. Wasn't enough for complete humiliation yet to be pooped under herself.

"Well, Rarity, are you ready to continue?” Twilight's impatient voice sounded as a sentence. The next flask with liquid has been violently poured in white unicorn’s throat, she has only wheezed, feeling as the magic spreads on her body.

Strangely enough, Rarity has felt better. Bloated belly jiggled and wobbled from the huge load inside him, but intestine bloating has started falling down. The stomach has slightly decreased and Rarity has sighed.

"Twilight,” she has poorly whispered. “I beg you to stop.”

"Wait a moment a little,” Twie told. “We almost finished. I have told that I need a unicorn for experiments.”

“You haven't really enough yet?” fashion mare begged.

"No, Rarity! You haven't understood!” Twilight has laughed. Rarity looked as her friend's huge balls wobbling in a step to giggling. “I can't ask you to be object of my experiments. You are occupied all the time. You will give birth to a unicorn for me, and I won't ask you about anything any more...”

"What?” - Rarity has dizzily whispered. The abdominal murmur became louder.

“You’re pregnant Rare.” Twilight explained. “You well be in labor soon.”

Rarity has shifted one's gaze to stomach, and she was stupefied. The belly was bulged as if on the sixth month of pregnancy, and the stomach has started humming demanding food. The feeling of hunger has rolled so unexpectedly that Rarity has swallowed saliva. She felt how her small nipples were inflated, turning into the udder ready to feed a foal.

"What, you are already hungry?” Twie has inquired, approaching Rarity to the head. She hooked a friend's chin by hoof and forced Rarity to throw her head back. Pony’s Eyes have swung open when Twilight's the member has touched her muzzle.

"Rarity, you don't understand how wonderful it is.” Twilight pushed her member in the friend's mouth. Her eyes have rolling up in pleasure. In only a few seconds having reached peak, Twilight’s length pulsing and firing thick, heavy stream of seed into the friend's throat.

Rarity has mentally burst in damnations once again, but the flow of a seed muffled awful feeling of hunger at least. She felt warm semen flood down her throat.

Rarity felt how skin on a stomach stretches again. Something grew into her, and it was her child. The udder was poured by milk too, and continued to inflating.

"Twins?” Twilight said doubtfully. “Or more? It seems that I have gone too far again.”

She has run all over a table, having thoughtfully touched her friend's udder, tasted a nipple. Rarity has shuddered, feeling as the Twilight drinks her milk.

Parted her lips, Rarity letting Twilight's cum and her own saliva pour out from her mouth.

"You know, Rarity, I assumed that you won't notice effects of our experiment. But, seemingly, after the delivery the stomach will stretch so that it is necessary to forget about a beautiful figure...”

Rarity didn't listen any more. She has already lost connection with reality. Pony has felt sharp pain in the bottom of a stomach. Rush of liquid flooding through her birth canal flowing down on a table, a floor and Twilight’s head.

"Amniotic fluid, there it is,” Twilight commented. “Now push. It will be precipitated labor.”

Rarity felt stir in a womb. The foal couldn't wait to see the light. Pain was simply infernal. Rarity never thought that it is so unpleasant. She had been in labor for over three minutes, but she already wants to scream in agony. Marshmallow pony quickly gasped, trying to concentrate on birth pangs.

“Perhaps, we have multiple labors here. It seems that there will be triplets.” Twilight noticed. Her mane was still ruined and slightly damp from Rarity's amniotic fluid.

Within minutes, Rarity was at her limit, she has been ready to burst, and then she has throw out from herself the first foal. The cub has shaking white scum from him. He was coughing up fluid and had his placenta attached.

After the third foal, Rarity was flat-out. Her womb fall, like blown-off ball. Vagina bulged dreadfully as it passed all three foals. One after another, Twilight brought foals by telekinesis that those could drink mother's milk.

Rarity looked at her foals, and she was torn apart with mixed feelings. They were her foals. Her and Twilight’s.

Even if given born by an unnatural method, but they were her, and they deserved a good fate. "Unicorns for experiments," Twilight's voice sounded in her head.

“What's next...?” Rarity has sighed, darting a concerned glance at her brood.

"It is time to sleep” Twilight has smiled, shrouding Rarity with magic aura.

* * *

"Hey, Rarity, everything is good with you?” Twilight shook her friend's shoulder.

"Oh, Twie? What happened?” the white unicorn looked around abashedly. She sat in Twilight's kitchen near the cooling-down cup of tea.

"It seems that you have fallen asleep” the magician said with anxiety noticed. “Everything is all right?”

"Not really,” Rarity was recognized. “It seems that I feel sick.

Had AJ helped to make these pastries?”

"No. These are magnificent cookies," Twie noticed having stuck a nose in a jar. ”If you feel unwell, I can make experiment with Spike when he returns. And you should go home and have a rest.”

"Yes, perhaps," Rarity has agreed, hobbling to the door. "I will go home. I should have a sleep a little."

Having left library, Rarity for a moment has turned back to notice how Twilight closes a door. For a moment she seemed engorged penis that hung down almost to the floor between her friend's legs.

Rarity has shaken the head, getting rid of delusion.

"It seems that it is time to stop pursuing princes and find normal coltfriend from working stallions. Or it is possible lost last mind after all," she has sighed and went hobbling towards Carousel Boutique.