"Biff?! What are you doing here... and what are you wearing?" Sarah asked, Jon was confused, he was crossdressed like everyone else... wait everyone in the wedding, all the people watching were dressed normally, so it was some sort of crossdress wedding, so Biff did look out of place.
"I just want to make you happy, I wasn't comfortable with this at first, and it tore us apart, but if it means I can be with you I'll do anything." Biff pleaded
Sarah almost looked like she was trying to decide, but quickly said "I'm sorry Biff, I'm with Leonard now, we're perfect for each-other, and I wouldn't want to force you to be someone your not"
"So... there's no chance..." Biff looked so depressed
"I'm sorry but no, I love Leonard."
Biff acknowledged that he would never be with Sarah, and made his way out of the church.
The wedding continued and Leonard and Sarah said their "I Do's" and kissed.