All performers portray adults. With her husband away on a long-term work assignment, Reiko lives alone with her adult son. She gradually lets down her guard around Kashiwagi, her son's classmate and frequent visitor. Raised by a single father and obsessively drawn to her maternal warmth, Kashiwagi eventually pushes the defenseless Reiko down. His slow, relentless caresses make her cum again and again in ways her husband's routine sex never could. Pounded by his youthful thrusts and used almost daily, she awakens to her buried desires until her body completely surrenders to the pleasure.