When Jason found himself inside of Amy's body, he rushed as fast as he could back to his own house. He burst into his own room frantically, and then he froze. Amy didn't even notice him at the door; she was much too preoccupied with his body making love to his girlfriend. Jason stood there in shock for a moment before calmly closing the door. He realized swapping bodies with Amy wasn't some random event or an accident; it was intentional. It was all clear to him now. Amy wanted to be with his girlfriend, and now she had that. Now his only focus would be to figure out a way to swap back.