Unable to wean her son off breastfeeding, Ayumi struggles with his daily demands to nurse, until one day she decides to take a step forward. Hoping to ease his dependency, she makes him promise to stop, but habits are hard to break. When her son finally pulls away, Ayumi begins to feel a strange loneliness. To soothe this emptiness, she starts indulging in self-pleasure alone in her bedroom. The memory of his lips seeking her breasts, the sensation of his tongue sliding over her nipples—these vivid recollections highlight the depth of his attachment, driving her to lose herself in masturbation. Yet, over time, this act alone no longer satisfies her. A deep, rising urge to have her son suckle her breasts again begins to stir from within, sparking a profound transformation inside her.