Yuusuke, Ayame's son's childhood friend, grew up without ever feeling a mother's warmth. As a small consolation, Ayame continued to shower him with affection, treating him like her own child. He understood her kindness, and the two built a tender, close relationship. But now Yuusuke is maturing into a full-grown man, and Ayame begins to realize he's starting to see her not as a mother, but as a woman. Will their parental bond eventually come to an end? While lost in these thoughts, Ayame is caught masturbating by Yuusuke...