Living together with his wife and her mother, Ryo Ko, was peaceful and comfortable for the son-in-law. Their three-person household had been harmonious—until lately, when his relationship with his wife grew cold, and her rejection of his sexual advances left him frustrated. One evening, feeling restless and dissatisfied, he headed toward the living room when he heard strange, unsettling sounds coming from the bathroom. Quietly opening the door, he discovered his naked mother-in-law indulging in masturbation. Unable to resist, he pushed the door open, stripped off his clothes, and approached her. Startled, Ryo Ko tried to react, but he told her they should comfort each other. Exposing himself, he revealed his erect cock. Hesitant at first, she found her eyes locked onto his manhood—the first she’d seen in a long time—and instinctively reached out. “Just today… just this once,” she whispered, then leaned forward and took him deep into her mouth. The next day, alone at home, Ryo Ko recalled what had happened and felt regret—but the lingering pleasure between her legs refused to fade. When the son-in-law returned home, he pulled her into a tight embrace. Torn by conflicting emotions, she tried to pull away, but as he kissed her and caressed her body, her resistance melted. Before she realized it, her panties were soaked with arousal from his skilled fingers.