Honoka arrives home with snacks, juice, and candies which are her brother Hirokazu’s favorites. She notices an unexpected guest, Akasaki, a girl from his class whom he invited for a study session. Honoka misunderstands her as Hirokazu’s girlfriend and becomes extremely jealous. While Akasaki is still in the house, Honoka secretly seduces her brother, leading to passionate forbidden sex with deepthroat, paizuri using her big tits, raw missionary, and doggystyle until he gives her a creampie