A mother-in-law, Maki, secretly masturbating to release her unsatisfied libido without being bothered by her husband.Her withdrawn son, who was always peeking at her Maki through the gap in the door, was lusting after Maki's sexy back as she was doing a rag in the living room one day with her ass exposed. and attacked.Maki, who had completely forgotten about the existence of her step-son who was withdrawn from her life and thought she was alone, desperately tried to escape from her step-son who was trying to pull down her skirt and her underwear. but….