Marrying a physiologically weak husband makes Nanami Kawakami suffer from not being able to orgasm every day, but her husband is already satisfied. In contrast to her husband, Nanami's father-in-law always makes her mother-in-law moan every night, with a very strong physiology in contrast to her son, so her mother-in-law orgasms constantly. One unbearable night, Nanami could only lie outside the door of her parents-in-law's room to masturbate. Nanami couldn't stand the craving to orgasm more and more, so she decided to seduce her father-in-law...