Recently, the second wife, Chisato, has been dissatisfied with her husband who has been so busy with work that he has not been paying her any attention. To spite her, she has begun to masturbate violently on a daily basis. Her stepson, Kenta, who has been watching her pointless act, sneaks into her bedroom. "Is it daddy's fault that you're frustrated? I'll fill your lonely body for you." His sweet words and soothing caresses make her give in to his desire. His cock slowly stretches the walls of her vagina so that her husband, who is sleeping right next to her, does not notice.