After losing her husband in an accident, Ayano raised her daughter and saw her off into marriage. Concerned for her mother living alone, the daughter and her husband Tacto move in next door. Soon, Ayano discovers that Tacto suffers from a sexless marriage and frequently masturbates at night. Ever since her husband's death, Ayano had maintained strict self-restraint, but Tacto's huge cock captivates her, shattering her composure. 24/7, seizing every spare moment, she becomes obsessed with his thick cock, consumed by the desire for his cum. Meanwhile, Tacto finds himself increasingly overwhelmed—mentally and physically—by his stepmother's relentless advances, until he can barely resist anymore.