Due to her father-in-law wanting to transfer the house, Yui had to go to her husband's family home for the paperwork. She had grown fond of her kind and considerate father-in-law, but after he witnessed her sex with her husband, he started hitting on her the next day they were alone, claiming he could satisfy her better. Despite her initial resistance, Yui found herself becoming addicted to the pleasure as her incestuous father-in-law repeatedly drove her wild.