In Karyn's Body

Jon blinked and suddenly he was at Karyn's house. He looked out the living room window and saw Karyn's parents loading their luggage into their car. Jon looked around the seemingly empty house. "Karyn?" He froze when he heard his voice. It was *Karyn's* voice. He looked down at himself. He was in Karyn's body! The front door opened and Karyn's mom walked in. "Karyn, we're leaving. Come on," she said. If Jon had Karyn's body, then what happened to Karyn?