Seeing her son's rock hard cock while he masturbates, Arisa becomes excited. Even when she goes to bed, she can't get her son's cock out of her head, and her hand naturally reaches for her crotch and masturbates. Her son hears moans coming from his mother's bedroom and also witnesses Arisa masturbating, and the two become man and woman. Feeling guilty about the incestuous relationship, Arisa refuses to have sex a second time, but her son says, "This one would be better," and forces her into anal sex.