When Kouichi's father became busy with work, he was sent to live with his relative Yuri after losing his mother. Ever since childhood, Kouichi had been captivated by Yuri's graceful and tender beauty. Forgetting his role as her son, he begins craving the warmth of her breasts, stirring intense desire within her. As he fondles her large tits while she prepares dinner or touches her body in the bath, their relationship gradually deepens. Kouichi's lust grows uncontrollable, pushing their bond beyond the point of no return. Sensual moments unfold one after another, escalating into a fully erect, erotic drama.