After her marital sex life began to decline, leaving her restless and unsatisfied, young wife Minami started living with her father-in-law, who had recently gone through a late-life divorce. Her father-in-law possessed a strong sex drive, and on nights when her husband was absent, his attention became increasingly focused on her. Alone together in the house, they eventually became intimate. Minami was gradually captivated by his astonishing sexual skills and impressive manhood, which brought her intense pleasure. Driven by a powerful desire her husband lacked, he thoroughly stimulated her vagina, bringing her to climax again and again. Even after her husband returned from a business trip, their affair did not end—it was only the beginning of something new.