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Fed up with their son's poor studies, the parents ask their friend's wife, Mao, to be a tutor. However, the son is captivated by Mao's sexy figure, and instead of concentrating on his studies, he is constantly daydreaming about erotic things. Mao is in a difficult position, so she takes drastic measures to improve his grades. However, the private lessons she offers are too obscene and dirty. Free trial points available for the first time!