Reiko has not been working at night since her husband became single.When such a horniness does not fit, she happened to witness the big cock of her son-in-law, Tetsuya, who lives with her.Seeing Tetsuya, who is sexless and lonely and indulged in masturbation, Reiko tells herself, "As a mother, I will take responsibility and make it easier," and pushes him down when her daughter is asleep.From that day on, her libido, which had been suppressed to the very limit of her limit, exploded, and she toyed with her splendid cock that became his binging many times.