After divorcing her husband and living alone with her son, Sumire had been troubled by a certain matter. Her son had begun directing his overflowing sexual desire toward her. She was inwardly conflicted about what to do. "This really shouldn't be happening," she thought, but despite her resistance, she was overwhelmed by his momentum and opened her body to him. "Not inside! At least use my anal!" she cried, opening her asshole to her son. Sumire Shiratori retires from the AV world with this work. Her final insertion is anal!