Although they are a single mother household, their son has grown up to be a fine young man. Miki is relieved that she has successfully fulfilled her role as a parent, but at the same time, she feels lonely because she has forgotten the joys of being a woman while prioritizing raising her child. Miki's loneliness erupts in an instant when her son gives her a massage. By chance, her son's hand touches Miki's nipples, as she is not wearing a bra. She reflexively lets out a lewd moan. This trivial accident awakens Miki to the pleasure of her nipples, which are turned on by just touching them...