Ryoko, who was widowed, decided to live with her daughter and son-in-law. Recently, she had gotten used to that life and was living happily. One day, Ryoko was wiping the floor, and when she suddenly raised her eyes, she saw her son-in-law's crotch. It had been a long time since she had seen a man's crotch, but her eyes were glued to his unusually large bulge. A few days later, late at night, Ryoko accidentally witnesses her son-in-law's masturbation scene. Ryoko couldn't take her eyes off her son-in-law's erect dick, which was hard and arched upwards, and her heart wouldn't stop pounding. One day, when Ryoko was going to her son-in-law's room with the laundry, she found her son-in-law napping, perhaps because he was tired. As Ryoko was about to leave the room quickly, her son-in-law's bulge appeared again. Ryoko struggled for a while, but she succumbed to her desire to see it raw once, and quietly went to her son-in-law's bulge. She was just poking it lightly, but she became fascinated with its growing size, and before she knew it, she was stuffing her mouth full of it and drooling...