With a lack of identity, Biff was motivated to walk into a house he was familiar with. It was the McMillan house, home of his girlfriend Sarah McMillan. He walked into the house and walked past Jon McMillan, who didn't even notice him, then up the stairs and into Sarah's bedroom. Sarah wasn't there. She was in the bathroom, getting undressed to take a shower.
Biff went straight to the closet and pulled out the clothes he intended to wear to school that day. He always thought that the outfits that Sarah wore were incredibly sexy, but he never imagined that he would ever wear them himself.
After he took off his clothes, he put on a bra and a pair of panties. Despite the fact that they were girls' clothes, they felt right.
As Biff began to put on one of Sarah's pink halter tops, Sarah was about to step into the shower. But then she stopped. Her eyes glazed over and she wondered why she was there. She turned around and walked out of the bathroom, completely naked, and made her way downstairs. On her way out of the house, she passed Jon, who thought he was her mother. No one even noticed that Sarah had left.
