Seduction: Not Karyn

Jon opened his eyes and then opened the door, but it wasn't Karyn that he saw standing in the hallway. The expression on his face went through a multitude of emotions in those brief seconds. Relief changed to shock and terror, then the terror changed to outright lust for the person he saw. Jon didn't care if it was socially unaccepted or morally wrong. He would do *anything* to have sex with the person he saw. But who did he see?