Yusuke, a childhood friend of her son, grew up without knowing the warmth of a mother. For many years, Ayame has treated Yusuke like a mother and showered her love on him, hoping to provide him with some comfort. Yusuke also adores Ayame, and the two have built a good relationship. However, now that Yusuke is growing into a man, Ayame senses that he is beginning to think of her as a woman, not a mother. Maybe it's time for the parent-child play to end. Just as she was thinking that, Ayame was seen masturbating by Yusuke...