This role-play is performed by adults. One year after remarrying, Rieko is an obedient wife in front of her husband, Tatsuo. However, his son Kenta doesn't seem to like Tatsuo... He was conscious of Rieko as a woman, not as a mother, and would often secretly vent his excessive sexual desire next to her while she slept. Although Rieko is aware of this, she pretends not to know. However, she feels so sorry for his brave behavior that she ends up having a relationship with him. Mother and child know that it is a forbidden act, but their raging desire knows no bounds...