Not a single hair

Mike and his sister, Deb, had been visiting their parents during their college winter break. They stumbled across a machine in the basement that their dad had been working on; the strange invention switched their bodies! They both freaked out, but couldn't seem to figure out how to reverse the process. Their father looked at the circuits and determined there was damage. It would take a few days to fix. In the meantime, they would be stuck as each other. Mike hated being stuck in his sister's body. He couldn't do anything about the bouncing breasts on his chest, but the hair was another story. He talked about shaving it off, but Deb screamed. She warned him not to mess with a single hair on her head!