Ever since he started living with his wife's mother, Yukari, the son-in-law has been having troubles. Maybe my mother-in-law is incredibly erotic... Once he had this suspicion, he impulsively peeked at her getting changed. Her huge breasts were so tightly squeezed together that they looked like they were about to pop out, and her shapewear was so tight that it was hard to see her buttocks. The son-in-law was taken aback by his first glimpse of his mother-in-law's voluptuous body, and that night he couldn't control his desire and made a mistake...