GVH-391 Yumi Narusaki, a son-in-law who aims for her mother-in-law's obscene big breasts

Koichi, a son-in-law, lives with his wife and her parents. - A daughter and her husband who are not blessed with children are interfered with by their father-in-law, asking, ``What's going on with having children?'' - Koichi answered that he had no sexual desire, but the real reason was that he was fascinated by his mother-in-law Yumi's obscene big breasts! - Koichi's desire for grace has reached its limit and he attacks her exposed big breasts while taking a bath! - Koichi's courtship escalates as Koichi loses all sense of reason, and Yumi, who is unable to handle her ripe body, ends up drowning in a domestic affair...