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.
