MIDE-581 My sister became my exclusive maid for three days. Minami Hatsukawa

My cute but strict sister found out about the hidden test and got furious. I studied hard and got 100 points, so I asked her to become a maid. I will put everything into these three days alone with my sister. She always does what her master says, but when her real sister comes out and does something erotic, she gets upset but still listens to orders. It feels so good that I gradually become obedient.