Four adult mother-son role-play stories of forbidden sex beside an unsuspecting husband. In Episode 1, a son sees his parents having sex and begins viewing his mother as a woman. In Episode 2, Reiko knows her son watches at night and rewards him for keeping quiet. In Episode 3, a son protects Rena from a husband who uses her whenever he is angry, just as they consider living alone together. In Episode 4, an unemployed alcoholic husband controls a mother and son who feel unable to resist him.