Minami lives happily with her beloved husband and her daughter, but it has become a habit to masturbate at night without any help. And that was the same with his son-in-law, Tsuyoshi, who spent days comforting himself by looking into her. Minami, who was fascinated by his big cock, disturbs his heart and continues to seduce him every time. The son-in-law couldn't resist the invitation of his mother-in-law, and one day the two of them devoured pleasure day and night.