Kozue has been involved with her son for half a year now. It all started when she was taking care of her drunken son, who then became affectionate, and she gave in to his advances. She had initially convinced herself it would be a one-time thing, but their relationship continued to escalate. Today, once again, she surrendered her body to her son's desires. This time, she resolves to finally end the affair and create distance between them. However, unable to endure the ache in her body, she begins masturbating. Her son, watching her from the shadows, wonders how he should respond.