Kanae once struggled with sex addiction but had since settled into a peaceful daily life. One night, while peeking into her daughter and husband's bedroom, she discovered her stepson passionately dominating her daughter. The sight left a deep impression on her, awakening long-buried memories of pleasure. When she realized her daughter would be away overnight on a business trip, Kanae seized the opportunity and aggressively seduced her stepson into a series of forced creampie sessions.