"Jon! It's you!"
"Already?" said Jon.
"Of course," said Jeff. "It had to come up sometime. Here's your command. Take off your pants and rub your crotch against someone. I'm not telling you who to pick, or how much to do it, or whether you need to take off anything else. You can decide that."
"Uhhh..." said Jon. Hesitant, he still decided he'd do it. Jon removed his pants, showing a pair of boy's underpants--even in the new reality he had mostly still worn those. If he had typically worn panties, Jeff would have instantly spotted something strange way back in the locker room without having to ask. Still, the lack of a bulge showed that he certainly didn't have what a boy would normally have down there.
At first he thought the best course of action was to leave the underpants on and limit the crotch-rubbing to just a brief second. But he changed his mind, after considering what it would be like to rub against...