Since his son Takumi got divorced when he was 5 years old, his father, who has raised him single-handedly, remarried. And he started living with his mother-in-law, Miki. Miki, who takes care of her, actively tries to shorten the distance between her and Takumi, and ends up doing her mixed bathing. Takumi, who was overwhelmed by her girlfriend, accepts it... However, the stimulation of her body being washed is too strong for the virgin Takumi, and he irresistibly erupts. Miki gently wraps him who is trembling with her shame. And that triggered a secret practice with her mother-in-law in the bathroom.
