Perverted Family: Big Brother's Tutor

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Two brothers live in a fine house that was left to them as an inheritance after their parents died. The older brother is a medical school student, and the younger brother is a law student. However, the younger brother doesn't seem to be able to rely on his older brother's academic ability. Worried that if things continue like this, he won't be able to graduate or even become a doctor, he decides to ask for an excellent private tutor. The tutor who came was a very beautiful woman, and she said that her brother's lack of confidence was due to his virginity, and that she would teach him both studies and sex. The younger brother is stunned, but he is told that he will introduce his younger sister to you, and when she arrives, he is taught how to have sex. And the tutor sisters end up living with the brothers at home. SEX lectures are held every day in the house. Eventually, the sisters' mothers and fathers come and live with them...