The brother's wife was forced to divorce him due to his excessive sexual prowess, and the younger brother and his wife decided to stay with him for a few days. Shortly after arriving in Tokyo, the brother-in-law witnessed Yukina masturbating and approached her. Her unsatisfied and hot body could not be controlled, and she gave herself over to her brother-in-law and ended up having sex with him. From that day on, Yukina's pent-up sexual desire exploded. Whenever her husband wasn't looking, she sucked her brother-in-law's dick, and as soon as he left for work, she unashamedly indulged in creampie sex with him.