Biff plopped down onto the bed and took a look around Jon's room. Or, his room, maybe? Unless the woman was harder of sight and hearing than Biff could've imagined, there was no way she could've accidentally mistaken Biff for Jon, yet she acted as though him sleeping there was the most logical thing in the world! And this was most certainly Jon's room; there hadn't been a van sent to this house that he could see, so they couldn't have possibly changed anything, right?
Nonetheless, Biff's curiosity was lit anew, and again he took it on himself to search the room again. This time he had something in mind when looking around: he wanted to find some evidence that would unequivocally show this room as Jon Madison's. He wanted an ID or a wallet or a note with Jon's name on it or something. Wasn't there a note with that weird rock he saw? Or maybe he could look through Jon's book bag?
Finding Jon's school ID in the bag, he was prepared to start the day. He headed out of the room, prepared to sneak out. "Jon," a female voice called. "Are you heading into the shower or what?"
He whirled around and the teenage girl standing there showed no signs of recognizing him as not Jon. She looked to be a freshman, and a pretty hot one at that. This must be the sister.