A writer on 4chan's Comics and Cartoons board, "The Amazing Writer-Man," churned out this little number in response to a thread asking for "I think we need a sexy X-Women thread." I asked for permission to repost this, of course. The thread was
http://zip.4chan.org/co/res/5950507.html, but that link'll be dead within 24 hours.
***
David Sloane, age twenty-one, was your typical college kid. Living in debts, struggling to get through the educational system, David flowed on through life with no usual irregularity.
More specifically, he fit into the archetype of the geek. In highschool, he'd been all about chemistry and genetics, hoping to become a great scientist like Reed Richards. His grades were decent enough, and he had at least one friend - Sarah Holmes, a girl who'd been his classmates back in highschool. She too had entered Empire State University and, as luck would have it, had been placed in class alongside David.
David awoke one morning, rubbing his eyes blearily as he put on his glasses and made his way to the bathroom. Scrutinizing himself in the mirror for a moment, contemplating the future of his currently scruffy looks, he leaned back, yawning, eyes closed, and thought, "Hmm... guess I could use a shave." Before reopening his eyes, he brought a hand to his cheek to feel the rough hairs... but they weren't there. "Wha?" He blinked. His vision was blurry, even with the glasses. "Stupid things must be scratched..." he said, discarding the optical wear and returning to eye the mirror.
"Huh... guess I'm more out of it than I thought... must've shaved without realizing it," he said, and continued his preparations to get to class.
Gathering his things, he rushed out of his dorm towards ESU, thankfully only a few blocks away. He checked his watch. "Uh-oh... I'm gonna be late," he muttered nervously.
Suddenly, he heard a clicking noise behind him, a noise that he'd only previously heard on TV: the readying of a gun. A gruff man's voice growled, "Gimme all yer money, kid."
David froze. His heart started beating erratically. Sweat pulsed down the sides of his face. "O-o-kay," he whispered, scared. "I-I'll give you what you-"
"Boy oh boy!" said another voice. "You really are just a walking stereotypical dumb thug!" David's eyes shifted upwards to find a man in a red and blue Spider outfit clinging to the tree above them. Spider-Man jumped down, landing in front of David and the mugger. "I mean, how dumb d'you have to be to mug a college kid? College kids are broke, man."
The mugger gulped. "D-don't come any closer, Spider-Man... I'll blow this kid's brains out."
"Alright, alright," said Spider-Man. "We'll all just cool down here..."
Just then, time slowed down for David. He could hear the mugger's heartbeat, the stress he placed on the trigger... and on pure instinct, David reacted. Throwing his arms backward, he delivered a swift sweeping kick to the mugger's legs, catching him, and finishing him with a throw to the ground.
Time resumed its usual pace. "Woah-hoh!" said Spider-Man, impressed. "From afar, you looked like just this scrawny kid, but I guess you're some kinda martial artist, huh?"
David panted, "Y-yeah, I guess."
"Well, that's cool enough to warrant a Spidey-five," he said, raising his palm. "C'mon, dude! Don't leave me hanging! Get it? Spider? Hanging? Is this mic on?"
Eventually, David raised his palm to match Spider-Man's. With one last nod, Spidey swung away. "That was pretty weird, actually..." thought Peter, swinging away. "I wonder if... nah."
David entered his genetics class, still confused. How had he been able to subdue that mugger? Spider-Man had been right on first glance... he WAS scrawny... so where did that strength come from. "I need a drink..." he muttered wearily.
"So early?" said a sweet voice next to him.
He turned. "Sarah..." he said, pleasantly surprised.
Sarah sat, swinging her red hair behind her, flashing her sparkling green eyes at David. "Hey David... you okay?"
He nodded nervously. "Yeah, yeah... just having a weird morning."
"What happened to your glasses?"
"Oh, those?" he said, more confused by that particular event, "I, uh, I broke 'em, and-"
"Another pair?" she said in disbelief. "David, that's like-"
"Alright, students, take your seats, let's begin," said Professor Samson, teacher of genetics. "Now, let's begin with section 2-D of the reading..."
His voice faded from David's ears as the lecture droned on. David stole a glance at Sarah, diligently taking notes. "Oh man... she's so hot," he mused. "Even if she doesn't have that great a rack or an ass... I should totally ask her out. Yeah, I'm gonna- No." He sighed. "You're going to do what you always do: be too much of a pussy to ask any girl out. That's why you're a twenty-one year old virgin." Another sigh. "Still... she would look good with some tits..."
A tiny moan escaped Sarah's lips a second later. As her right hand wrote, her left hand reached up to begin massaging an apparently odd sensation in her chest.
David's eyes shot open, his senses amped up once more."Wha- what the fuck?! Her- her boobs are-"
But all around the classroom, more tiny moans fluttered through the air. David's eyes, magnifying the area, spotted each and every woman of each and every size suddenly groping their own chest. Bigger and bigger they grew... a few even began inserting fingers between their legs. Though more and more he was shocked, his erection also took notice.
His hand shot up. "P-professor!" he called.
"Hm? What it is it, Sloane?"
"I-I need- M-may I be excused for a drink of water, p-please?"
Professor Samson raised an eyebrow. "Sure. Go for it."
"Thankyouverymuch!" he blurted, speeding out the door, his legs stronger than they'd ever been. He did not stop at the water fountain or anywhere else. Instead, he ran, faster and faster, yearning to get out of the school.
His eyes caught a woman passing him in the hall. Involuntarily, his finger jabbed at her and suddenly, a mass of breastflesh began bulging through her sweater, a high-pitched "Ooh!" escaping from her lips.
"Gah!" David yelped in shock and continued running. It seemed to him that women had chosen to congregate on this day specifically, as he suddenly found himself unintentionally morphing female form after female form. Large breasts, thick lips, and tight asses emerged all over the streets of Manhattan, women buckled over in pleasure, until finally, David arrived back at his dorm, slamming the door tight.
A week passed.
A knock at the door. "Hello?" A female voice. No answer. "David Sloane?" she called, knocking again. Still, no answer. "C'mon, I know you're in there."
"Go away!" he called, lying on the sofa, shivering. "Please... I don't wanna hurt anyone else!"
The voice cooed softly, directly above him. "Don't worry... I know you won't hurt me."
He jolted, turning his face towards the direction of the voice. A beautiful, long-haired brunette's face hung above his. "Hi!" she said cheerfully. "My name is Kitty Pryde. I'm an X-Man."
"Ah... I know you..." he whispered, "Y-you're Shadowcat, right?"
"Just 'Kitty' is fine," she said. "I'm here to help you."
"You... are?" His eyes caught sight of her chest: already beginning to swell. "Oh, no, no!" he groaned, jumping from the couch and running towards the bathroom, locking himself within. "I've already done it... please, leave before it's too late!"
Kitty passed a palm over her chest, sighing in relief, before phasing through the bathroom wall. "It's okay, David. I'm fine." He did not respond, aside from the slight surprise at seeing her phase. "In case you haven't guessed, you're a mutant." More silence. "And your power... is to alter organic mass."
"I-I know..." he whispered. "I can't control it... day in, day out, I've been m-making girls' b-b-boobs and butts bigger," he said awkwardly. "I'm horrible..."
"That's why I'm here. I'm going to take you to Professor Charles Xavier, he can help you get this under control."
"No!" he protested. "I don't want to leave, I don't want to do it to anyone else!"
She frowned. "Close your eyes," she said, outstretching her hand, "I wanna take you somewhere." He hesitated. "Come on..." she said soothingly. "It'll be okay." Nervously, he grasped her hand and she began to phase. But as soon as she'd made contact with David's hand, the changes resumed. Her uniform was getting tighter. She gritted her teeth, doing her best to stifle a moan and failing. "We're here," she said at last.
David relinquished her grip, opening his eyes. They were now in a large, mostly empty room. "Where... are we?" he asked.
"This is a place the X-Men keep for temporary storage... I think it'll work great for what I have in mind."
"What's that?"
"Often, mutants lose control of their powers when an excess of energy builds up in their body without sufficient discharge." She reached down, licking her lips in front of his. "I think you need to discharge some energy," she whispered.
He turned away. "But... I don't wanna make you do that... I couldn't..." he said.
She sighed. "Well, here's the thing..." She began unzipping her uniform, a thick cleavage bulging out. "I've always hated being flat. I want to be big and beautiful, gigantic, and I think you can help me out here." Her now DD-cup breasts flopped out of her uniform. "What do you say? Can you do me a favor?"
He gulped. "O-okay..." Kitty pounced, reaching for his tight pant zipper and pulling it down with all her might. After tearing away his boxers, Kitty discovered his massive erection.
"Guess he's been altering himself here..." she mused. Lifting her new breasts, she smothered David's thick, long cock, taking the tip in her mouth. David moaned as she pumped her still breasts up and down, letting their soft warmth engulf his shaft while she worked the tip with a swift tongue. The dick started to throb. "That's it..." she thought, pumping harder still, "Give it to me!"
David too grasped Kitty's tits, teasing the erect nipples with his thumbs. Finally, he came, a geyser of semen erupting from his cock into her mouth "Ahh..." she moaned in satisfaction once she'd swallowed the load, stripping off the remains of her costume. Parting her labia, she whispered, "My turn."
David, confidence restored, attacked, taking her tits and trying a new spin on his powers. Kitty felt her entire body erupt in sexual sensitivity, like one large erogenous zone. Her tits surged forward, becoming larger than beachballs. Kitty screamed as David's cock pierced her, writhing in sexual ecstasy.
Pressure began building inside Kitty's massive behemoths. She shrieked; a flood of milk poured from her nipples. David drank in as much as he could, smiling at its sweet taste. As Kitty's mind deteriorated further and further into that of an insatiable nymphomaniac, her tits swelled, larger than overstuffed beanbag chairs.
Eventually, Kitty's size made it so that David's dick would no longer reach. Without the source of her ultimate pleasure, she began whimpering. David smiled, obligingly extending his penis so that he could still fuck her while reveling in her massive flesh, but pausing before re-entering her.
"Wha-?" was all she could formulate in her broken mind.
"You're mine," he said, grinning. "You're my big-titted bitch, now. My own personal cumdumpster."
"Ah-huh..." she moaned, pained by the lack of sex.
"Say it!" he commanded.
"Ah... I'm... y-your c-cumdumpster!" she shrieked.
"Excellent," he said. "Now you get your reward." His cock, thicker than ever, thrust into her, stretching out her cunt, and Kitty's face lit up in joy.
More and more, her tits swelled, until they took up 90% of her body mass. She had become nothing more than a pair of milk-blasting breasts attached to a woman. David had encased himself in her cleavage, a warm, pulsing womb of sheer pleasure.
Finally, she came, he came, the two of them climaxing in pure ecstasy. Even still, David could not help himself, making Kitty bigger, and bigger, until finally, he heard from outside the massive cleavage...
A whimper.
A human being was calling out for help. And so, he concentrated, shrinking Kitty down to a manageable size and reverting his own body to its usual shape. A minute passed with the two of them panting in their naked forms. "S-see...?" said Kitty with a smile, "I knew you could do it."
Epilogue
Several months later.
At the Xavier institute, David removed his hands from Laura Kinney, X-23's head. As she opened her eyes, her hands moved to her newly grown breasts. "Big... soft..." she muttered. She glanced at Wolverine, who, though he wore an uncomfortable expression, nodded approvingly. She smiled at him, and then to David. "Thank you."
David smiled back. "Don't worry about it."
David spent his days meditating, constantly focusing on the control of his abilities. He'd learned to use his powers for creation as well as destruction, but the balance was difficult. Occasionally, another X-Man, usually a female, would approach him and interrupt his meditation, asking for an alteration to their body. He obliged, grateful for the chance to practice his abilities. Of course, having several buxom young women around was always a plus as well.
"Hey, uh, Dave, right?" said Wolverine, putting his arm around him.
"Yeah... what's up, sir?"
"Now, you and I ain't known each other for that long, but I been seein' what you been doin' around here. You do... good work, let's say."
"Uh, thank you," said David, somewhat uncomfortable.
"Now, a few of us've been wondering, so as a sort of favor, student to teacher, I gotta ask..."
"Yeah?"
"D'you do any work..." he pointed to the ground, "... down there?"