Keiko discovers her stepson masturbating and finds herself unable to look away. She never expected to witness such a scene. Though she knew her daughter and son-in-law were abstaining from intimacy while she was staying with them, she hadn't realized how much it was affecting her stepson. Intending only to ease her guilt, Keiko decides to help him with her hands and mouth. But she soon realizes her actions are only fueling his desire even more.