My friend's wife is a lewd private tutor

When his junior's wife, Aoi, learns that he is a private tutor, his father decides to ask his stupid son who can't study at all to teach him how to study. He trusted Aoi's serious, polite and humble personality, but Aoi's true face was a lewd wife who was hungry for the dick of a young man... Aoi takes the temperament of her daily sexual desire and gradually provokes her crotch, but her stupid son's virgin cock is in no way possible...