My tutor, Mina-sensei, is my father's lover! My mother attends a tea ceremony class every Saturday, and taking advantage of this opportunity, my father suggested Mina-sensei to become my tutor, so that they can easily have sex more discreetly! And since then, every time Mina-sensei comes to teach me, she will make an excuse to go outside to have sex with my father! Because it happened many times, I became suspicious and followed sensei to witness them having sex. Not only that, every time my father ejaculates inside her pussy. With so many occurrences, sensei is definitely going to get pregnant! And one time when I peeked at the two of them, Mina-sensei also noticed me, but she not only didn't stop but also deliberately moaned louder. After that, Mina-sensei proposed to give me a handjob to keep this secret. I agreed, and the inappropriate affair between the tutor and my father continued. But in the end, I couldn't bear it anymore! I also want to have sex with this beautiful and seductive tutor! Waiting for my father to get tired after sex and go to sleep, I asked Mina-sensei for permission to have sex with her. Mina-sensei agreed, but with one condition, I had to rank first in the upcoming exam...