The teacher handed out the formula test tubes and set them on the table. Ty picked up the tubes and pretended to read the directions on the lab sheet. "Don't worry, I'll do the reaction part" he nodded to his lab partners Jack and Chelsea as he poured the formulas into the beaker together.
POOF! There was an instant explosion in the beaker, and a miniature volcano of reddish liquid was thrust upwards like a fountain, directly down onto the table, Ty's lab partners, and Ty's hand, which was holding the beaker. As his tablemates scrambled to clean up the mess and Ty pretended to help, he noticed how his hand seemed to have absorbed the liquid and was now dry.
Just as Ty noticed, he felt a tingle in his groin. Suddenly, his underwear began to feel tighter, like he was getting an erection. But he knew it was really the formula! Sneaking a peek down at his shorts, he could see the front of his shorts swelling up slowly. It was already swollen past the mostly flat bulge that he had possessed this morning, and still growing. Just how potent was this formula, he wondered.
His teammates had finally finished cleaning up, and Jack offered to do the reaction next. Ty gratefully accepted the offer and quickly got up to take the bathroom pass. As he walked, he felt his enlarged privates jumble around inside his shorts, and looking down he could see a definite bouncing movement up and down in the crotch region. And it was still growing, although a bit slower now.
Slipping out of the room, Ty thanked the stars that the bathroom was nearby. Just a couple of paces and he was at the door. Quickly wishing that the bathroom was empty, Ty opened a stall, went in and locked it.
Sighing in relief, he glanced down at his crotch in wonder. He had only gotten a small dose on his hand, but now his shorts were absolutely bulging to the maximum. It was a wonder none of his clothes had ripped. At least his genitals seemed to have stopped growing. Gingerly, Ty unzipped the fly of his shorts and pulled both his underwear and shorts down.
Out flopped Ty's massive genitalia. If he had to guess, he'd more than doubled his original 5" hard length. His new cock had to be about a foot long, and it was still completely soft! Ty's balls had also swollen to the size of softballs. Together, it looked ridiculous on a high school age boy, especially one as thin as Ty. Pulling his underwear back up, he carefully positioned his cock through one of the leg holes, then pulled his shorts back up over it. The zipper no longer strained, but anyone who gave even a passing glance at Ty could easily see his monster cock.
Ty wondered how his lab group was getting on... he'd better check on them! Quickly he left the bathroom, his soft cock flopping against his leg all the way as he walked back to class.