Ty and Dustin laughed as Craig strolled in. He was Dustin's maths teacher's 6 year old son. A cute little kid with bright blonde hair and a cute high-pitched voice, and apparently popular among his friends if his mother was to be believed. He grinned amiably as he saw the pair and spoke happily:
"Hey guys!" he said cutely
"Hey Craig! What are you doing here?" Dustin replied, a little worried. Ty on the other hand was totally oblivious to the possible ramifications of his actions, and instead laughed at the idea.
"I need a wee!" he replied basically, doing a little dance to indicate his need.
"Well, uh, I wouldn't go in there, uh-" Dustin began, before being interrupting by his foster brother
"Don't worry about it, kid, around the corner there!" Ty directed, grinning mischievously as he did.
"Thanks!" And with that the boy was at the urinal.
Craig unzipped his trousers and pulled them down a little, doing the same with his pants. He pulled out his 2 inch penis and slightly revealed his tiny balls. He frowned as he realized he couldn't wee, and then groaned a little as the changes began. He cock began to thicken and lengthen, and his balls expand. They grew to an obscene size, and his cock to a full foot long. Craig gasped as a surge of testosterone hit. In almost an instant, he grew 8 inches to the height of 4ft 8. He was already tall for his age, but was now easily on of the tallest 6 year olds out there. His skinny, pre-pubescent body began to bulk up slightly. He probably put on only a few pounds, but it showed on his little body. He had a pretty well defined six pack and fairly bulky arms. He had the beginnings of a serious pair of pectorals, and his shoulders broadened slightly.
Ty grinned as he saw the change. The jump in testosterone at such a young age put him at a serious advantage to his peers. He would always be bigger and stronger, and would probably grow to become a real man after puberty. Ty predicted 6ft 7 or 6ft 9 and easily over 200lbs naturally. Craig fell back slightly, looking at his willy with confusion. He then noticed Ty staring at him.
"Ty? What happened? What's wrong with my willy? And my clothes; they're too tight now!"
"You grew! You're huge now!" he replied happily. Craig looked at his arm muscles and tensed them slightly, before smiling.
"Oh, okay!" he said obliviously, before struggling to tuck the monster back into his trousers. It ended with a noticeable bulge in his left leg. "See ya!" And with that his skipped out.