Tiffany's second wish was granted to the closest person to her. In this case, that was Sarah. And when she made the wish, she was looking straight at Biff.
Suddenly, Sarah was compelled to give her boyfriend a blowjob. It was something that she had never done before. Oral sex just wasn't her thing. (Although it was Tiffany's.) But right now, she wanted to do it more than anything.
She walked towards him, pulled down his pants, and sucked him. And she kept sucking him until he had an erection, but that wasn't for another two hours at least.
