"I'm not sure, mr Mendes." Giovanni replied. "I don't want to grown up in front of everybody, it would be embarrassing."
"I volunteer." Sanjay said while he stood up. "It's not like we have another choice, Gio."
"Ok, Sanjay. Be ready." Mr Mendes told him but, in fact, he had something else in mind. "If you don't want to rip your clothes I suggest you to take them off."
Sanjay nodded and he immediately began to take out his shirt, exposing his prepubescent torso. However, while he was taking out his belt, mr Mendes' magic beam flied across the classroom. Although he was worried that his pants will burst out of him at that moment, he quickly realized that he hadn't changed at all. The magic beam hadn't hit him and he was still a 10 years old kid.
"Mr Mendes? What did you do?" Sanjay asked but when he looked at his teacher, he noticed a satisfied smile on his face. He didn't know why until he looked back and gasped when he realized who was Mr Mendes real target.
"Uh?" Giovanni who hadn't any time to react to the magic stood still, shocked and confused of what had happened. He didn't know that he was going to change, so his kid's clothes had bursted out in an instant leaving him naked, his feet grew so fast that his shoes ripped like if they were made of paper, exposing hairy toes and long manly soles.
His height increased double of his previous size, while his arms and legs lengthened at the same time. Big muscles grew all over his body, on his arms, legs and chest like if he use to hit the gym every day; his jaw turned squarer and his baby fat practically dissapeared.
"What the-?!!" He shouted and immediately stopped when he heard how deep he sounded after he got a prominent adam's apple in his thickened neck. Finally, hair sprouted on all the areas where it hadn't been before. On his legs, his arms and his chest. His armpits and crotch got an extra special treatment as they became way more thicker than any other place. Even some hairs were visible on his back and butt.
"Dude, you're really hairy!" Troy shouted while he stared at the new man in class. "Aaand really hung!"
Giovanni blushed after hearing that and looking down at his crotch, he saw his new manhood for the first time. His former puny dick and balls had changed from a little 2 and a half inches long to a monstrous 9 inches long rock-hard erection. It's skin turned a little bit darker and really veiny. His foreskin had pulled back and a glossy mushroom tip was proudly pointing upward like his grown-up fellows.
His marble balls had grew to match his schlong and they were filled of fresh virgin cum, they grew hair too but it wasn't too much like his crotch or his armpits. He was so embarrassed that he tried to hide it with his bigger hands but he just messed them with precum instead.
"Oh jeez!" Giovanni said after he watched disgusted at the dripping precum coming out from his dick tip. He seemed so ashamed that everyone can't avoid but giggling of him.
"Gio, are you ok?" Sanjay told to his friend who was way more taller than him. "Don't worry, you don't have anything we haven't seen before."
Giovanni was in a mix of feelings but he suddenly stopped moving and walked next to the other naked young men. The control spell had taken effect on him when he started to think with his dick.
"You can talk again, Giovanni." Mr Mendes commanded. "How do you feel?"
Giovanni's robot stare disappeared and he looked terrified again. "I'm so ashamed. I didn't know I was going to get so big and hairy. It's so weird." He looked down again and blushed once again. "What... what can I do to cool it down? I don't want that anybody sees my dick looking like this!"
"I was thinking about it too." Mr Mendes said. "But I think we can do something interesting with your erections before you get them soft, guys." He smiled and began to look through the book pages.