Twilight Sparkle has a Magically Scientific Sex Change and has a Threesome with Big Macintosh and Rainbow Dash

by TheBigStallowski

Rating: mature
Tags: My Little Pony: Friendship is Magic, Rainbow Dash, Romance, Sex, Comedy, Big Macintosh, Scootaloo, Random, Twilight Sparkle
Length: 1094

In an experiment gone wrong, sparks light up and transsexual sex is had. Oh boy.

Uuugh here we go again. Twilight Sparkle invites Big Macintosh over to help with a scientific experiment. Unfortunately, due to Spike's sudden but inevitable demise at the hands of polio, the experiment goes wrong, and the two swap genders! Hilarity (and butt-buddiness) ensue!

Published 2014-08-26 15:00:01 UTC
Last updated 2014-08-26 15:00:01 UTC

The Machine

Twilight Sparkle has a Magically Scientific Sex Change and has a Threesome with Big Macintosh and Rainbow Dash

Created By:

TheBigStallowski

This story brought to you by: Annoyance with a recent featured fanfic, drowsiness, and the don't-use-the-backspace challenge

Deep in Twilight Sparkle's ~~lair~~ ~~dungeon~~ ~~fortress~~ bondage cave basement, machines bleeped and blooped and whirred and buzzed as the Princess of Friendship was hard at work reading manuscripts printed from machines far beyond the advancement of that of Equestrian society's. Meawhile, Big Macintosh stood in all his muscular and simple farmpony might in an open testing capsule.

Spike would've mentioned that he can't quickscope... Twilight thought solemenly. Ever since Spike's death at the hands of The Polio, Twilight moruned the death of her prized ~~slave~~ ~~butler~~ ~~manservant~~ ~~janitor~~ ~~squire~~ vibrator dragon-thing. She was sad so she did lots of experiment stuff to distract her gigantic brain-mind from actual emotion.

"Erm... you sure about this? Why exactly am I being epxerimented on?" asked the powerful stallion in the test tube.

"that's easy! Fro science!~" exclained the pretentious Alicorn. "And because I'm paying you tree-fitty bits."

"Fair 'nuff" replied Big Mac. It was time.

Twilight now was ready. all was complete and well for the experiment to be done, an experiemtn that would change all of ponyville and the world forever. "Spike, pull the lever!" shouted the mare as she pressed the button. But she'd forgotten: SPike was dead from THE POLIO, and upon pressing the button whe thole room was filled with a bright white light.

Okay, yes, it's awyas a bright white light. Tht has nothing to do with white privilege, tublr. ABACK TO THE BLOT, IO MEAN PLOT! CURSE THIS CHLLENGE!

tWILIGHT awoke to find that she was different sumehow. She felt sotrnger, more msucular. She looked down to her private-square and BEHOLD! "Wow! That's even bigger than Shining Armor's corndog!"

Her surprise was interupted by a seductive ly deep famale voice. "Eeyup".

The purple stallion looked up to see Big Macintosh: Now a tall, proud, slender, sweaty, gorgous, feminine, wonderous, abple-bucking- I just got a boner. BUT SO DID TWILIGHT, FOR BEHOLD, HER CORNDOG WAS NOW LARGETR THAN EVER BEFORE. "Sweet CELESTIA that's a big corndog!" she explaimed.

"We gotta fix this!" yelled Big Mac, not about to be mare-handled by the now mlae Twilight Sparkle. She knew of men's horniness, expecially unicorns. Get it? Because, you know, horns. Yeah fuck you too. She then began typing on the console "Hopefully something unbelievable strange and stupid doesn't fix this easily solveable problem!"

Then all of a sudden in a eerily prophetic but clumsily protrayed way, the machien exploded as Rainbow Dash crashed from the ceilng directly intro the machine. While the machine was #wrekt beyond all believf, Rainbow Dash was perfectly. fine. She then eyed the Big Mareintosh honrily, and a masive wingboner sprung forth upon her back. "HOT DIGGETY!" she exlcaimed as she produced a strapon. She had been preparing herself for this moment for a long time.

Big Mac spotted RD"s wingboner. When she was a he, he was always fond of the mare's ezquizite beauty. And now she wanted him now that she was a he, because when she was a he RD was only into shes which was not he for he was not a she and she had no interest for he. Now, she was suddenly horny, nd bent over for Rainbow Dash. "Please, I give myself ot you!"

"Oh boy!" exlcaimed Twilight as she and Rainbow Dah pounded upon the ex-stallin with their massive corndogs. One in her mouth and one up her butt. They then commenced the act of mating: all three of them. They worked and worked on her as she lusted and bewcame wettewr than a seapony.

Then Twilight leaned over. Rainbow Dash furiously working her platsic shaft like a machine gun was so, so hot. By Celestia, her tenactiy, her furiousness, her power and strangely feminine domnative bueaty. He grabbed her head by the ears with his wings nad pulled her closer, kissing.

Sick to her stomach with the idea of having kissed a stallion, she threw up all over Big Mareintosh. But TRHAT ONLY MADE TWILIGHT SPARKUP EVEN HORNIER. "Oh boy! ". Her corndog grew even more, completely filling Big Mareintosh's mouth. Would it grow eny larger, he jaw would unhinge.

Strugglign to speak, she attempted to say "Oh Twilight, you beautiful stallion, yoju!" But it only came out as "glagh gluigh glug-glugh." and a few little gags as Twilight's corndog traveled further down her throat.

They kept going. Yes, they had changed genders, but despite andy and all psychological truama from a drmatic shift, they only cared about ponytrating Big Mareintosh. The logically minded Twilight Sparkle knew the only thing that mattered was ejaculating the juices of her corndog into Mig Mac's mouth. All of a sudden, a new feeling came toTwilight. So this is what climaxing stallions feel LIKE- her thoughts were cut offr as an explosion of his stallion-suace poured and poured into Big Mac's mouth.

hte process went on and on: Twilight comtinuing to cum as Rainbow butt-fucked the helpless mare. From the sice of Twilghjt's corn dog, she could not voice any concerns as Twilight, in his exctasy, continued to hold Big Mac in place. He kept cumming, and cum ming, and cumming. It seemed it would never end. Big Mac squirmed, fear in her eyes at what was happening.

"Oh, we got a fighter on us! LI like when they're fighters" yelled Rainbow Dash, thinking it was just some sort of erotic play. Twilight could not see the fear in the mare's eyes ad his eyes were closed becaue of the massive orgasm.

For Big Mareintosh, the lights were going out. She could not breath anymore as sh e was being filled and filled: she was drowning in Twilight Sparku;ps stallion syrup. She was so full that it was even starting to leak around the edges of Rainbow's strap-on. It was beauitful. Well, not for Big Mac. Eveerything wen t black and she went limp.

. . .

Big Mac, still female, awoke on a bed of clouds. Was this heaven? She turned to see Spike, wearing a golden fedora. Tipping the fedora, he spoke but a single word.

"M'lady."

Big Mac came.

Author's Note

I'm... not even gonna bother reading this atrocity that I just wrote.

UPDATE:
https://www.youtube.com/watch?v=_V_krgE0jJo
"What I did, I did without choice.... in the name of peace and sanity."
"But not in the name of the Trollfic."