Reiko carelessly exposes her deep cleavage around her son-in-law, convinced no one would notice an older woman's breasts. But while his wife no longer excites him, Reiko makes him rock hard. He attacks her with his throbbing cock and even gives her a creampie. Sex reawakens Reiko's long-dormant desire, and she claims responsibility by volunteering to satisfy him whenever he needs release, beginning their sinful affair.