Akari Niimura, a beautiful woman with a big ass that seems to burst violently, is full of the charms of a mother-in-law! Akari has become a family with her older husband who has a teenage son. She has not had sex with her husband for over two years and is frustrated. To vent her frustrations, she changes into her favorite erotic underwear and indulges in masturbation, but her teenage son sees her...!