Machi and Ken are lovers. Machi, with her nymphomaniacal and proactive nature, and Ken, who's into masochism, engage in a dominant/submissive dynamic. Unknowingly, their father, Hiroshi, becomes curious about the noises coming from their room and peeks inside. What he sees shocks him: his son being anally penetrated by his girlfriend! From that moment on, Hiroshi can't get Machi out of his mind. As if sensing his thoughts, Machi seduces and toys with her boyfriend's father, trapping him in a forbidden pleasure he can't resist while her boyfriend is away... !
