Takuya's mother, Kaoru, is always beautiful and kind. Since her husband died, she has been living with Takuya. Until now, Kaoru has been relieving her desires by masturbating, but when she is excited by her son's friends and reaches her limit of endurance, her son's friend Takeshi comes to visit while her son is away... Kaoru seduces her son's friends with erotic underwear...