Justin saw that Ben was still muscular as he had been before, (and thus immobile) but only a foot tall. seeing this Justin realized just how much power he now had, he could humiliate Ben just as he had been humiliated, or he could make himself the bigger brother. Justin decided on both.
he walked back into the bedroom after one last look at Bens massive muscles, and started to get the changes done.
first he typed in his name and hit increase muscle. the effect was immediate the feeling of his growing muscles made Jen feel invincible and he went hard. then he focused back on the task ahead. he went back to Ben and hit decrease height, one inch. then at muscle he hit reset so that Ben’s muscle would be back to normal but he would be only an inch high. then Justin waited until his jeans and t-shirt burst to hit stop increase. he was now a muscle god who could still move freely. then with a quick decision he changed his own height to 7 feet 5 inches. and used the program to give him clothes that fit him well.
Going back to play with Ben he couldn't see him. but didn't worry because there was no way he could get out of the living room.
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Ben's Point of view
"oh God I hope he won't find me." Ben was now hiding under the couch. he had got run there when the transformation ended. at first he felt just his muscles getting smaller, and thought that Justin was just going to make him his slave, then he saw everything around him slowly getting bigger, he realized Justin had also decided to shrink him. Ben didn't run yet hoping Justin wouldn't be to horrible. but when he saw Justin come out of the bed room (ripping the door off in the process) with his new height and large muscles that seemed like they wouldn't need much more growth to shred apart their prison. he ran.