Karin lives a comfortable married life with her kind and gentle husband. However, she has one complaint: living with her vulgar and insensitive father-in-law. She is fed up with living with her father-in-law, who sexually harasses her on a daily basis. One day, her father-in-law finds Karin asleep while her husband is away. Taking advantage of his son's absence, he secretly pulls down her underwear, devours her genitals, which smell of female and sweat, and thrusts his penis into them...