Despite her refined and elegant appearance, this stepmother has the unexpected habit of urinating outdoors. Married woman Ayako Inoue is also engaged in an affair with her masseur. One day, her son-in-law catches her in the act and begins pursuing her. Guilt-ridden from her infidelity, Ayako lacks the strength to resist and gradually succumbs to his advances. Overwhelmed by her stepson's sensual touch, she eventually surrenders to pleasure and accepts his cock. Witness the taboo lovemaking of a depraved wife who grinds her hips for two men other than her husband.