After losing her husband and living in loneliness, Mio was recently invited to live with her daughter and son-in-law. Her son-in-law always treated her with kindness and consideration, for which Mio felt deeply grateful. One morning, in the soft sunlight, she accidentally caught sight of his crotch. Though she'd never paid attention before, the bulge far exceeded anything she'd imagined. Trying to stay composed, she couldn't help but glance twice. One day, she accidentally saw her son-in-law masturbating in the changing area of the bathroom. The moment thick, white semen shot out powerfully, a spark ignited within Mio. On days when her daughter was away, her son-in-law often took naps. Mio began using this time to quietly approach him, watching and waiting for her chance. Gently touching him through his boxer shorts, she felt him slowly respond. Carefully pulling the fabric aside, she saw his fully erect, impressive cock. Smiling softly, Mio leaned in as if drawn by an irresistible force, taking him deep into her mouth. With her tongue, she teased the sensitive tip, which continued to swell. As she pleasured him, her own hand drifted between her legs, touching herself as she savored every sensation of his manhood. Suddenly, his cock throbbed and a strong burst of pungent, milky cum flooded her mouth. At that very moment, Mio herself quietly reached a gentle climax. She sucked him dry, savoring the rich taste of his semen, letting the flavor linger in her mouth for a long, indulgent time…