Sumire lost her husband and lives with her daughter and son-in-law. One morning, she accidentally sees her son-in-law's bulging crotch. She had never paid any attention to it before, but it made her take a second look. Then, a few days later, she happened to come across her son-in-law taking a nap. Even though he was asleep, his bulging crotch was enough to draw Sumire in, and she ended up playing with and sucking on his crotch. That night, as she masturbated alone, remembering the feeling of her son-in-law's crotch from the day before, her son-in-law appeared...