Momoko, who lives with her daughter and her husband, has not had sex for the past few years, and masturbation is the only way to release her sexual energy. However, one day, she is captivated by her stepson Kazuya's huge penis. Furthermore, she is not having sex with her daughter and has no sexual outlet, so she attacks Kazuya while he is sleeping, making excuses to herself by saying, "I feel sorry for him for being frustrated." Momoko, who felt her sexual desire was at its peak, could not stop after just one time, so she repeatedly tempts and sexually attacks Kazuya...