The popular series by Natsume Benkei, who has produced one mother-son incest masterpiece after another, has finally been made into a live-action film! It's the duty of a tutor to scold her son to make him study hard, but... she's taken on the task of satisfying his sexual desires! As long as she follows the rules, she'll fuck him and cum inside him every day! She won't even show her face while they're fucking, she keeps her moans to a minimum, and she's only supposed to do it from behind... but she can't help but get turned on by the intense piston-like thrusts of his adolescent, virile dick, and gradually becomes horny and cums! She fantasizes about her mother teasing her while using her pussy, which she's enjoyed in real life, and she even cums so hard she's allowed to do things other than doggy style, so "sex beyond duty"...?!<br /><br /> The original doujin work of the popular doujin work "