Alisa gets excited when she sees her son's dick bending back as he masturbates. - Even when she gets into the futon, she can't get her son's cock out of her head, so she naturally reaches for her crotch and starts masturbating. - The son, who noticed the moans coming from his mother's bedroom, also witnesses Arisa masturbating, and the two end up in a relationship between a man and a woman. - Alisa refuses to have sex for the second time due to the guilt of incest, but her son presses her for anal sex, saying, ``It's better this way.''