Hana, a married woman with huge breasts so big they look as if they might spill out, comes to tutor her son, Shinichi. Shinya, the father, cannot take his eyes off her breasts and hurriedly leaves the room, but... Hana, who has a sexual fetish for the smell of old men, seduces Shinya at every opportunity. He cannot suppress the excitement in his groin at her lewdness. Shinya is excited by the fact that he has not ejaculated for over ten years, and there is no way he can refuse her obscene behavior...