Rainbow Dash and the Monster Horse Cock

Windy Whistles stared in stunned horror at the second floor bathroom.

"Sorry Mom," Rainbow Dash said weakly as she trudged past her, headed back to her bedroom. "Thing's like a friggin' firehose..."

Windy whimpered at all the piss dripping off literally everything, collecting in stinky golden puddles on the floor, lavatory, and in the bathtub.

* * * * *

Sunset Shimmer wore an umbrella hat and a rain poncho as she sat on several thick towels spread out on Rainbow's desk chair, observing the proceedings with bemusement. Twilight Sparkle had donned safety goggles and latex gloves, and a black medical bag sat on the bed next to her; she'd perched herself on the end of Rainbow's bed, her legs tucked up primly underneath her. Her skirt was covered in jizz, but she seemed determined to studiously ignore that.

Pinkie Pie was the only girl present who didn't seem to care if she got splattered, dick-slapped (which had already happened to Twilight twice), or otherwise "made no-no" with Rainbow's dick, as Fluttershy so eloquently put it; Pinkie was presenty rocking back and forth on her heels as she watched Twilight examine Rainbow's monster horse cock. Fluttershy was outside the bedroom door, watching the entire thing from a relatively safe distance and through gaps in her fingers.

After a lengthy process during which Twilight measured the member, took Rainbow's blood pressure several times, took the dick's blood pressure, and listened to Rainbow with a stethoscope everywhere, Twilight sat back with a sigh and threw up her hands. Rainbow's dick flopped over backwards, landing directly between her bare blue breasts, the tip tucked just under her chin. A spurt of cum blorted out, coating Rainbow's face.

"It's definitely magical," Twilight pronounced. "If it wasn't, Rainbow Dash would've died hours ago."

"DIED?!" Rainbow yelped, eyes wide.

"I don't know where your horse dick's blood supply is coming from, but it seems to be functioning independently of your own body. If it wasn't, there wouldn't be enough blood flow to your brain for you to, y'know, live."

"Gaaaaaah."

"Is it some kind of parasite?" Sunset asked.

"No, it's part of Rainbow's body," Twilight said. "I'm just not sure how it's a part of her body."

"So...how do we cure my little girl?" Windy asked from the door. "Is...is there a cure?"

Twilight sighed. "For now, it's best not to do anything until we hear back from Sunset's friends in Equestria. Honestly? Anything we do without completely understanding how this even happened is probably going to make things worse."

"Oh dear..."

"In the meantime, we need to perform some more in-depth examinations," Twilight said, a slightly nervous hitch to her voice. "And...it'd be best to explain to Principal Celestia that Rainbow will be out of school for a while, unless we can find some way to contain this thing to where she can function normally."

"What, you mean like getting Rarity to make me some kind of cock bra?" Rainbow asked. This drew muted giggles from Fluttershy, loud giggles from Pinkie Pie, and an eyeroll from Sunset.

"What do you mean by 'in-depth examinations'?" Sunset asked.

Twilight grimaced, her cheeks heating up. "W-well," she began, her voice hitching, "Rainbow's new appendage seems to be producing impossible amounts of ejaculate, almost at will—"

"Totally at will," Rainbow said with something of a sly grin. Her grin faded. "Actually, totally at random, too. Basically, if it bumps into anything it spurts."

"Yes," Twilight said, idly wiping a stray strand of Rainbow's cum off her safety goggles. "And thanks to Pinkie Pie's earlier, ahem, probe, we more or less know Rainbow's original reproductive system is still intact and functioning, much like any natural-born hermaphrodite."

"Okay, so...?" Sunset prompted.

Twilight's face flushed. "Well, given the nature of the, ah...affliction..." She coughed to clear her throat. "Purely in the interest of collecting as much data as possible for a thorough scientific study of the phenomenon, I would like to observe its behavior during..." She licked her lips. "Stimulation."

Fluttershy squeaked.

Sunset stared at Twilight flatly. "What."

Rainbow blinked. "Uhh. Whaddya mean?"

"She means bom-chikka-BOW-WOW!" Pinkie said with a loud giggle.

"WHAT?!" Rainbow cried, shooting straight up in bed. Her dick swung down fast and hard, smashing into Twilight's face and knocking her off the foot of the bed with a loud *CRASH!* Rainbow blinked as her dick landed on the footboard. "Oh jeez! Twilight, are you okay?!"

"'m good," Twilight said dazedly as she got to her knees, swaying slightly, her glasses askew. She stood up, straightened herself out, cleared her throat, and continued, "As I was saying, I'd like to record data on the behavior of this phenomenon during direct stimulation." She paused, then added, "Also, its behavior during vaginal stimulation...hmm..." She began pacing. "Observing varying degrees of stimulation intensity would produce a broader variety of results to interpolate—"

"Uhh...anybody wanna translate?" Rainbow asked warily.

"She wants to watch you fuck somebody with that thing," Sunset said.

"And to see what it does when somebody fucks you in your poony-poon!" Pinkie added with a happy giggle.

Rainbow's irises shrank to pinpricks, her cheeks flushing brilliantly. "Gahuh?"

"Um, excuse me," Windy said. "I...don't quite see how that helps figure out what's...what's going on here..."

"It's observational science!" Twilight cried defensively. "If we want to understand the great mystery, we must study all its aspects! We must embrace a larger view!" She adjusted her glasses, which gleamed in the reflected sunlight from the window. "Only through science will we be able to save your daughter from her magic monster horse cock."

Everyone gave her a half-lidded stare.

"Yeah you just wanna watch a dickgirl getting banged," Pinkie said in an uncharacteristically matter-of-fact tone.

"FOR SCIENCE!" Twilight cried desperately. "Besides, magic is crazy weird! Maybe if she uses the thing for what it's made for, it'll go away on its own!"

The others looked to Sunset questioningly. She blinked. "Well...it's not a totally insane theory," she said. She frowned. "Except there's just one problem. Where the heck are we gonna find a girl crazy enough to even TRY to ride that massive pony pole?!"

"Don't look at me," Pinkie said. "But I do know who we can get for the other part of all that..."

"Soarin?" Rainbow Dash asked, a faint hopeful note in her voice.

"Flash Sentry?" Twilight asked.

"Bulk Biceps?" Fluttershy suggested.

"Big Macintosh?" Sunset supplied.

"Nope!" Pinkie said cheerfully. "Zephyr Breeze!"

A tumbleweed rolled through the dry silence.

"Oh HELL NO!" Rainbow thundered, her dick flopping around in rage.

"Well he has been trying to get into your pants forever," Sunset said with a wry smirk.

"Yeah and there's a reason he hasn't even come close!" Rainbow replied.

"Hmm," Fluttershy hummed thoughtfully. "Actually, I'm liking this idea."

Rainbow stared at her in betrayal. "WHAT?!"

Fluttershy shrugged. "Futa really grosses him out," she said. A small, evil smirk graced her pretty yellow face. "It'd be worth it just to see his reaction to this. Also, if he does still go for it despite the giant horse penis, just think about my creepy brother getting completely splattered in horse cum..."

Everyone in the room stared in mute horror at Fluttershy. "I'm scared now," Sunset said quietly. "How did I ever get away with bullying you? You're pure evil."

Fluttershy ducked her head shyly and looked away, a coy smile on her face as she played with her hair.

"Okay, so we'll get Zephyr Breeze over here to conduct the first part of the experiment—"

"HEY! I didn't agree to that!" Rainbow interrupted.

"—and then we'll figure out how to deal with the second part," Twilight continued over her. "It...might take a while to find a girl who's brave enough and limber enough to even try to take that...thing." She shuddered. "I mean, I don't mind doing manual stimulation of it myself, but I'd rather not tear every muscle in my lower torso to shreds trying to ride that."

"Yeah, hard pass on that," Sunset said, wincing.

"Yeah, same here," Pinkie said. "I'm not that crazy."

"We need somebody who's used to taking really big men inside them for that," Fluttershy agreed. "Like...maybe Ditzy Doo? I mean, have you seen her boyfriend?"

"Or Principal Celestia," Rainbow suggested. "I've heard...stories."

"This has to be the weirdest conversation of all time," Windy said, shaking her head. "I mean, I can't believe I'm actually a part of...whatever's going on here..."

Rainbow chuckled. "Never a dull moment around here, Mom," she said. She sighed. "Alright, fine, I'll let Zephyr rail me so you can get whatever sciencey stuff you need, then...we'll worry about the other stuff."

"I'll go call my brother," Fluttershy said, stepping out of the room. A minute after she left, Rainbow suddenly started and shot Twilight an odd look.

"Wait...did you just offer to give me a handjob?!"

Twilight made an 'enh' gesture with her hand and giggled sheepishly.

The horse cock twitched.