It's for the science, Dash
Once upon a time, on the magical land of Equestria, there was a magical purple unicorn named Twilight Sparkle. And a not particularly magical pegasus named Rainbow Dash, she was however talented in breaking the laws of physics, a pretty good flyer, and was good concealing how prod she was about that since her friends showed her how much of an attention whore she could be sometimes.
Synthetic energon, cybernucleic acid, and a predacon claw. These were the ingredient chosen to create the perfect talent enhancement potion, but Twilight Sparkle didn't accidentally add extra ingredients to the concoction because she's a fucking professional.
After nailing it like a baws and ponder if such aberration should even exist, her friend well nicknamed Rainbow Crash came inside her house.
THE END
No, but seriously. She came almost splitting Twilight's potion all over her floor. It was good luck that Rainbow could catch the potion with her mouth. Accidentally drinking all of the gooey and salty fluid, almost voluntarily. Because, really, what kind of attention whore drinks something after seeing an evil face smoking an evil face out of it.
After a long and boring explanation from Twilight about how the potion was supposed to enhance somepony's special talent, Rainbow Dash started to get exited about how fast she could fly now. And yes, she started to feel how something started to grow up between her hindlegs.
Startled at first, and after hoofing it to one side and the other, she understood why sometimes those meat rods are called ding-dongs. After smiling silly at her own internal joke her first natural reaction was to hide it from twilight. I mean, she had her wings once on her belly were her crotchboobs should be, so it wasn't as weird as you could expect for a Ponyville dweller.
However Rainbow's attitude had passed from uninterested to a bit too normal, and that was very very suspicious for Twilight how already was scratching destructive tests in her imagination to run on her friend to find out the exact effects of her untested potion.
Twilight ran to get her ponies analyzing machine from her basement. Something that Princess Celestia had gifted her for her birthday before movíng to Ponyville. Meanwhile, Rainbow Dash had tried to use that opportunity to fly away from there, but when she arched her body into flying position, the stressed foreskin of her penis gave in retracting itself from her new an sensitive glands, and the breeze on her new grown up member was enough to throw her down to the library's floor again.
She had became so excited imagining how she was going to brag about her new big penis as soon she were outside of the egghead's hideout, that she was now the carrier of a massive erection. After realizing the massive proportions of her hardened extremity, all she could think about was now what to do with her sensitive and humongous new limb after arriving home, forgetting about the figurative show up parade that she had made up in her mind. Which wasn't an easy feat from her.
Not before Rainbow Dash had started to touch herself, Twilight had turned from her basement realizing that carrying that machine outside was utterly silly, and that was easier to take Rainbow Dash into the basement.
Picking her up like a curled cyan package with wings, Twilight placed a neuronal analyzer on Rainbow's head, and hooked her four legs up in the analyzing pony machine, making painfully clear the side effect that such potion had on her.
"Rainbow!" Twilight exclaimed. "You're a dick!" She added, realizing her friend had a surprising ability to be a dick.
Knowing what she mean, Rainbow Dash gave thanks to Celestia for not being a complete asshole, but with her four legs and even her wings secured around in the strange contraption that was holding her body in a vertical standing position, she hit some kind of displaying Nirvana. Her erection had started to feel more tense, her hard on was starting to be painful, and love juices from her intact marehood had started to drip through her thighs.
Twilight Sparkle who was more an egghead than a real pony of science, was impressed by the effects of her own creation. The scene was more one of those pornygrafic magazines that some magic school companions had showed her during some shameful hazy memory, than some of those forgettable made up lessons of which she wrote in her letter to Princess Celestia to keep having grades from Canterlot, and a connection to the royal family.
The size of Dash' member was impressive, especially considering the average size of males isn't even perceptible at first glance even when most of them are always buttnaked, but Rainbow Dash' size was more the one of a fifth hoof on her. The cyan foreskin wasn't completely retracted, but ended in a fresh tone of pink before the shinny glands on the top of her meatrod. Just below her new member, her female organs were unaltered, but since Twilight Sparkle was conducting a test, an d unfamiliar at the default genitalia in Rainbow Dash, she decided to start conducting an observational study starting with what was less intimidating for her, Dash' labia part.
Her labia was fluffy and a lot of lubricant liquid had escaped from there. Twilight used a hoof to separate one side of these cyan swallowed lower lips and some more of her fluids immediately ran from there over her hoof. Rainbow Dash was struggling to get out of the machine and said something that Twilight didn't understand. Probably just moans, she thought. Returning to her investigation she realized that her hoof was already on Rainbow Dash' small clitoris that was reacting pretty much as her counterpart just above.
Rainbow Dash spoke something that Twilight couldn't hear again. Almost disregarding it again as meaningless verbiage, Twilight realized that she had started to touch herself.
Booth of her hooves were drenched and her own genitalia had become stimulated as much as Rainbow Dash' one without even noticing at all. Giving a second thought about this, Twilight realized that her machine had acquired a lot of information already, and that her hooked up friend had an expression that seemed to be one of pain.
Being sorry for corrupting the scientific method like that, Twilight was reading herself to freeing her friend, but after a quick glance at the analysis of the machine she found out that her friend was in fact enjoying all of this, and a lot.
"Rainbow Dash, I think we should keep on investigating this." Twilight said in a sultry tone of voice, while tightening the device holding Rainbow Dash' limbs in place.
