One day, Tohru reunites with a childhood friend and ends up staying at his house for the night. There, he witnesses his friend and his mother in her fifties, lustfully entwining as they devour each other's genitals. Tohru is turned on by the ripe, voluptuous body of the fifty-year-old and her strong sexual desire, and he confesses his feelings to his friend's mother. Unable to control her strong sexual desire, the mother has a relationship with her son, but in response to Tohru's feelings, she reveals her perversion, opens her ripe pussy, takes his erect penis into her mouth, and revels in the intercourse.