The kind, beautiful, and hardworking wife of his son, Yuri, has been taking care of the retired, lustful father-in-law day in and day out. Despite his age, the father-in-law couldn't help but cast inappropriate glances at Yuri's youthful, ripe, and voluptuous figure. His son, who should be satisfying such a devoted and virtuous wife, seems utterly incompetent and pathetic in that regard... Feeling sorry for his son's wife, the father-in-law, unable to bear it any longer, succumbs to a forbidden act!