When her husband was transferred away from home, Hinami could not bear the loneliness and started cheating on him repeatedly. But one day, her stepson Yuichi saw her having phone sex with her lover. Sweat dripping from her voluptuous body, drool flowing, and juices overflowing endlessly from between her legs... The lewd scene his stepmother showed Yuichi left him more aroused than angry. So Yuichi made an unexpected proposal to Hinami: "I'll take care of you in your father's place."