My friend's wife is a lewd private tutor

The parents, who are not good at studying, are given the trouble to their son, so they decide to ask Mao, a friend's wife, to become a private tutor. However, her son, who is captivated by Mao's sexy appearance, ends up concentrating on his studies and ends up spending all sorts of erotic fantasies. In trouble, Mao decides to take the initiative to improve her grades. But it was a very lewd and lewd private lesson.