Flutter Futa's Free-Use Free-For-All (Patreon)

Fluttershy walked into the main lobby of the building, trying desperately to forget the newly-acquired appendage between her legs that had a mind of its own. A magic accident of Twilight's had burdened her with an almost comically large, girthy cock, complete with two heavy testicles dangling beneath it. Even when flaccid, the mighty cock practically hung down to her knees. Until Twilight found a way to reverse it, she was stuck with the daily torture of her constant desire to fuck girls and jerk off. No wonder men were such perverts, she realized, if they were all burdened with these urges. 

Going to class was a daily struggle; being surrounded by all these cute, young girls in tank tops and short skirts often made her newfound man-meat stiffen involuntarily, and its immense size made hiding it rather difficult. Her best bet was to look down at the ground and not so much as glance at anyone, but this made her look even more socially withdrawn than she already was. 

As she rounded the corner on the way to her first class of the morning, her heart stopped. She had forgotten, today was the last Friday of the month, AKA Public Whore Day. Girls who pledged to sororities and had to go through hazing were tied up in doggy style, their legs spread, and left for the male populace to have their way with. To make matters worse, today's whore was none other than Rainbow Dash! 

Fluttershy stared at her friend, tied up and vulnerable, her beautiful blue body, with her toned abs, perfect athletic ass, surprisingly generous tits, and of course, her tight slit unveiled for all to see. The sight of the feminine form once again foiled Fluttershy's aim of avoiding erections; she was hard under her skirt already. Even before having a cock, she'd had secret pervy thoughts about Rainbow, so now her lusty appendage practically screamed at her to empty her nut-slime deep inside the poor athlete.

While her head was turned, she noticed Fluttershy staring out of the corner of her eye.

"Oh, hey Fluttershy..." She acknowledged her, embarrassed at the current situation. But then, a lightbulb went off over her head. 

"Did, uh, did Twilight get around to getting rid of your dick yet?" She asked, slightly more hopeful-sounding than appropriate for casual small talk. Even someone as socially oblivious as Fluttershy could pick up what she was putting down. 

"N-no..." she shyly answered. 

Rainbow's face lit up with relief. "I need to ask you a huge favor... I NEED you to fuck me." She bluntly stated. 

Fluttershy recoiled slightly. Even if she knew that's what Rainbow was gonna ask, it was another matter entirely to hear it aloud. 

"When I heard I was gonna be a public whore, it was kinda exciting. I like a good fuck, after all." She began. "But so far, it's sucked! The anime club was here this morning to go wild on me. Those nerds had NO idea how to fuck a woman."  She rolled her eyes. "Plus they all had micro-dicks. I just need to get fucked by a massive cock! And you're the biggest on campus now... So, please?" Rainbow pleaded, disillusioned hope in her eyes.

Fluttershy's cock twitched. Rainbow Dash, of all people, was begging her to pound her pussy. Between her cock's uncontrollable lust and Rainbow's desperate pleading, Fluttershy had almost no choice.

"Oh, Yes!" She blurted, not able to hide her excitement. Until she remembered that it was far from polite to be that eager to rail a tied-up public slut. "I, mean, um... yes, of course, you're my friend after all..." She corrected herself, but her legs, wobbling with excitement, betrayed her true feelings. She wasn't sure if it was her or her male hormones that were responsible for the trembles of excitement, but she couldn't flip up her skirt fast enough. She had jerked off constantly, imagining situations like this, but now, her cock was getting what it wanted: A warm, wet, snug cunt to cum in.

Her monster erection unveiled, Fluttershy positioned her tip against Rainbow's eager pussy lips. Rainbow, though she was only able to see out of the corner of her eye, bit her lip in anticipation. 

"I'll, um... I'll try not to hurt you..." Fluttershy warned, a quiver in her voice.

"Oh, don't worry about that!" Rainbow scoffed. "Go absolutely wild!" 

"Okay..." She began working to cram her thick pole inside Rainbow's tight marehood. Her immense girth made it difficult, but the natural lube from Rainbow's arousal was helping.

"Oh, fuck!!" A shout escaped Rainbow involuntarily as the impossibly huge shaft filled her. "You're already deeper than any of the dweebs from earlier!" 

Fluttershy looked down, she wasn't even halfway in yet. 

Regardless, Rainbow's tight, slick cunt was already overwhelmingly divine, exactly what her cock had craved. As she worked herself in, deeper and deeper, instinct took over, her cock overrode her personality. She began thrusting in and out while reaching around to take two firm handfuls of Rainbow's chest. She moaned in delight, but Rainbow shouted in shock. 

"Yeah, you like that, slut?!" Fluttershy asked rhetorically, humping hard and aggressively, making her pendulous nutsack loudly slap with each thrust. Rainbow didn't respond, her eyes went wide instead. All that could escape her mouth were groans of both pain and pleasure. She didn't know what had gotten into her friend, but the cock-lust had rendered her unable to speak.

"Fuck yeah you do..." Fluttershy continued. "This cunt belongs to me, and so do these tits." She blurted, picking up the pace. "Who's cumdump are you?" She asked. When she got no response, she took the kid gloves off; she shoved her entire length in for the first time. "Who's cumdump are you?!" She demanded a second time.

"A-Ahh! F-Fluttershy's..." Rainbow struggled to answer, the sensory overload of the massive sausage currently rearranging her guts was taking up all of her brainpower. 

"Damn right you are..." She grabbed hold of Rainbow's shoulders. "Now shut up while I blow my load." 

With the increased leverage, Fluttershy gave a series of rapid, hard bucks, each accompanied by a loud grunt. At this point, a crowd of onlookers had formed, some recording with their phones. Despite the humiliation, Rainbow obeyed the command to keep silent. 

Finally, Fluttershy let loose one long, loud groan, as her huge cock fired rope after rope of hot, sticky girlcum deep inside Rainbow's snatch. 

Fluttershy pulled out mid-ejaculation, glazing Rainbow's perky round ass with the remainder of her cum, as if marking it as her territory. 

As her afterglow faded and her gooey seed dripped out of Rainbow's marehood, Fluttershy came to her senses. 

"Oops..." Fluttershy whimpered. "Think I got a little carried away..." 

She then noticed the crowd of onlookers recording, and froze in fear. The secret of her monster dong was about to not be very secret anymore...