Kyle was smart, and a good-hearted kid, and not bad looking, but he was too much of a nice guy to ever have any luck with the ladies. And he was a bit of a wimp, built like a string bean, and constantly bullied by bigger guys.
He'd had a crush forever on this extremely hot girl named Alyssa, who had friend-zoned him long ago, despite his constant attempts to get her to see him as boyfriend material. Alyssa and he had tons in common, both liking nerdy books and romantic comedies, but she still tended to go for the more athletic types. She was probably the hottest girl in school, tall and skinny with big boobs and a nice ass, and she generally got her pick of guys, so you could see Kyle's dilemma.
As it turns out, Kyle was kind of a genius, winning every science fair since he was a kid, and so he came up with a solution that was a little outside the box. If he couldn't win over Alyssa the way he was, then he would change. Radically.
Kyle had worked on a formula that would make him big and muscular, and would even give him a big dick. You see, while Alyssa was no slut, he'd overheard her telling one of her girlfriends that a guy she had dated was pretty big and she loved it, so he knew he needed to be REALLY big to get her attention.
They had both just graduated from High School, so Kyle's mom had invited Alyssa and a few of his friends over to celebrate. Kyle planned to drink his new potion in front of her, so that she could see him in a new light, and asked her to follow him into the basement. She was hoping that he wasn't expecting to make out as some weird graduation gift, but went anyway because she genuinely valued his friendship.
Unknown to Kyle, his mom had also invited Derek, who was probably Kyle's least favorite person. While Derek didn't beat him up per se, he did love to embarrass Kyle, having pantsed him several times and rubbed paint in his hair, etc. Generally he made Kyle's life miserable, of which Kyle's mom was largely unaware.
In any case, Derek got bored easily, and had wandered down into the basement to amuse himself. He stopped to look at Kyle's chemical apparatus and started reading his notes, as Kyle and Alyssa came walking down the steps.
"Come on Alyssa. I promise it will be a cool surprise," Kyle said, gently pulling her by her wrist.
"Fine, fine. Let's just get this over with."
"I promise you it will be awesome," he said as they got to the bottom of the steps. He looked over to his work table and was shocked to see Derek.
"Is this your surprise? Your super serum?" Derek said, holding out the vial that represented not only months of Kyle's work, but also his hope for changing his life.
Kyle's stomach dropped, and Alyssa gave him a bewildered look, as if to say, 'Is this why you brought me down here?'
Derek savored the surprise for a long moment, and then said, "Let's see if you're as smart as you think you are." Then he drained the vial in one big gulp.
A wave of dizziness hit Derek, and he felt tingles in his stomach that quickly spread through his whole body. His arrogant smirk faded to panic, and he wondered if he had massively miscalculated, but then he the tingles turned to vibrations, and he began to change.
Kyle looked on in horror as Derek started to grow, expanding and swelling right before his eyes. It was like his clothes all suddenly started to shrink, splitting at the seams as he got taller and broader, and his muscles grew larger. In under a minute his clothes were a shredded pile of cloth on the ground, and he had completely transformed. Derek had grown to roughly six-and-a-half feet tall, his shoulders broadening to half again their width, and his body was covered in huge, thick muscles. Even his hair was different. It had grown to collar length and was thicker, and he had grown a short beard.
Derek flexed his powerful muscles as Kyle and Alyssa looked on in stunned silence. His arms were gigantic, his mighty biceps the size of watermelons, and his thick pecs looked like racks of beef. His back had grown so big that his lats looked like folded-up wings, and his flawless abs were like rippling bundles of steel bands that shifted with his every movement, hard enough to serve as an anvil or to take a hit from a cannonball. Finally, his legs were massive, as big around as a man's waist and carved from granite, and they looked strong enough to uproot a great oak. Then Alyssa gasped, and Kyle saw the most incredible change of all.
Derek looked down, following Alyssa's eyes, and smiled wide. His cock had always been above average, a little longer and thicker than most guys, but now it was enormous. Completely limp it hung perhaps an inch short of his knee and was as big around as a can of soda. Even his balls were much bigger, easily the size of oranges, and he could feel the endless tide of potent cum within them. He grabbed his long, thick shaft with one hand and stroked it a few times, relishing the fact that even his new big meaty hands couldn't wrap its incredible girth.
Derek glanced over at Kyle, and then Alyssa, and his grin was pure evil. He slowly walked over to Alyssa, continuing to stroke his gigantic dick even as she stared at it, seemingly still too awestruck to speak. Once he reached her, he gently grabbed both of her hands, placing one on his powerfully muscled chest and the other at the middle of his extra long shaft, and her eyes fluttered in desire. Then he reached under her arms and lifted her like a child, slowly walking to the nearby couch, where he set her down, her hands still rubbing his chest and manhood. He glanced over at Kyle again, and proceeded to rub the head of his huge cock against Alyssa's luscious lips, and she immediately closed her eyes and grabbed his shaft with both hands, trying to work it into her mouth.
Kyle groaned and looked straight at the ground, and Derek chuckled. Alyssa nearly choked trying to force Derek's meat down her throat, only getting a few inches deep and spreading her mouth wide. Derek laughed again, and then lifted her to her feet, turning her to face away from him. He pulled off her skirt, and then tore her panties apart like tissue paper, and gently pushed her forward so her knees rested on the couch seat, leaning her upper body against its back. He turned enough so that Kyle got a good look at his towering penis, even more impressive now that it was fully stiff, and Kyle felt lightheaded thinking about what Derek was about to do to Alyssa.
Derek looked over at Kyle again, swinging his hips back and forth to make his fleshy spear sway side to side in a manner that would've made many women faint, but mostly just made Kyle feel sick. He slowly lined it up with Alyssa's wet slit, rubbing at it to tease her, which drew groans from Kyle and moans from her. Then he took a half step forward and plunged into her.
Alyssa let out a long, deep, slow moan and shuddered with pure pleasure as roughly half his monster was buried withing her, and she groaned and bucked a lit when he bottomed out with just over half his meat inside her. As he pulled back for the next stroke, he paused briefly so that Kyle could see that she had already cum on his humungous cock. For her part, Alyssa was barely holding it together, overwhelmed by his outrageous girth, which was setting off sparks of pleasure through her whole midsection as it hollowed her out. Derek punched his mighty dick into her again, and again, and then started seesawing in and out of her. Kyle could see that she came again after only a few thrusts, and finally turned away, sitting down on a chair and not looking at them.
Kyle wasn't sure how long they were going at it, but Derek was bullying her vagina, pounding her over and over, and she howled and moaned like a woman possessed, cumming almost nonstop. Her moans died down eventually, and he looked over just in time to see Derek let out a manly grunt and spray his sperm all over her ass and back like a firehose. Kyle absently thought that he hadn't cum that much in his entire life collectively, and turned away again.
Derek walked past Kyle, looking for something, and Kyle got a close up look at Derek's super penis. It was even bigger and more intimidating up close, and Kyle nearly vomited. It occurred to Kyle that Derek was probably looking for clothes that might fit him, and finally gave up, grabbing a couple of sheets out of the closet and making an improvised toga.
Derek paused at the door, and looked back at Kyle. "Yup. That just happened," he said, and walked out.
* * * * * * * * * * * * * * * * * * * * *
Derek didn't waste much time after he left Kyle's place, making a very awkward run to the store to get new clothes, and then posing for a variety of selfies for his new dating profiles, showing himself off in skin-tight shirts and shorts, spandex workout clothes, and even just his boxers. Every which way, his insanely buff and powerful body was on full display, and his huge dick made for an impressive bulge no matter what he wore. He couldn't hide it if he tried, not that wanted to.
Not that it was much of a consolation to Kyle, but Derek pretty much ignored him from that day on. After all, he was extremely busy getting laid 3-4 times a day and going to the gym occasionally to embarrass the biggest and baddest guys there with his absurd muscles and towering strength. He could literally curl more than anyone else could squat, and his muscles bulged so outrageously when he lifted that every man there was intimidated by him, and every babe wanted his dick. He was like a god now. The god of Manhood.
He had of course made an effort to fuck the entire cheerleading squad, which he completed in under two weeks, and he also banged that super hot chick from the drama club, plus two trainers from his gym, and a couple of college babes, too. His number had gone from three to over fifty in just a few weeks, and he absolutely fucked the stuffing out of every one of them, leaving them blissful, bowlegged, and dreaming about him.
He was the only guy on both of his dating apps with a perfect rating, and he had more matches than any three dudes. Also, though he hadn't measured, his dick looked noticeably bigger than when he first transformed, both a little longer, and definitely thicker. He figured it must be all the pussy he was getting, and marveled at his blessings.
