Their son is preparing for university entrance exams, but after many years of marriage Kenzo still has both intense love and lust for his wife, Kyoko. He strokes her thighs and asks for kisses even with their son nearby. Kyoko refuses while playing the proper mother, yet after the son falls asleep she reveals her lustful side during rough sex with her husband. Wanting to explore even kinkier desires, Kenzo waits until their son goes out and invites a younger adult man into their home.