That's a turn I bet he didnt predict happening, having to deal with Peter when it was his fault Peter likes the body in the first place. How is Dana taking the swaps?
Once Dana realized the swap was no accident, but that it was deliberate, she was totally in on the plan to freak out her boyfriend. She still loved him but he needed a lesson. There were so many female family members she could turn him in to, and she was going to be there to make him squeal and squirm in their bodies. He'd crossed the wrong family but after the initial shock and punishment, all were expecting a good time.