Ty knew what was going on, even though he was outside of the room ('cause of his power). He decided to make things even between the twins.
First thing was his hands and feet started to get bigger. They got longer, thicker, and wider - size 22 shoes, and his hands were bigger than dustin's head!
Then, very quickly, he got taller, a lot taller, stretching up towards the cieling, all the time getting more muscle. His pecs pushed out from his chest. His biceps bulged. His back got much wider. Dustin and the other jock watched in awe from the level of his belly button.
The now 9-feet tall (and still growing) jock kept expanding in all directions. His dick got wider and longer. First six inches, then a foot, then two, then three feet long! Soft!
His head hit the ceiling, and the growth stopped. His massive frame filled the room, pushing Dustin and the other twin against the wall, sandwiched between it and the giant jock's dick.
"Holy shit!" cried out the smaller twin jock. "You're huge!"
The big guy was speechless. Then it occured to everyone that they were stuck in the room!
Dustin tried to squirm around the humungous dick, but couldn't.
"Don't do that anymore" said the huge jock, "you'll give me a boner!"
But it was to late... he was already getting hard.