[FSDSS-475] 3 points on the test! Full marks for sex! I was supposed to teach my busty cousin who has grown too well to study, but instead she taught me about sex and she let me down, it's too hot... Summer! Kaname Momojiri (Censored)

One summer day, my cousin came to visit my parents' house in the countryside. My cousin is not good at studying, so I'll teach her... Her breasts are big... When I was worried about my cousin's breasts, "Isn't my brother a virgin?" I was seduced by her big boobs, was taken down at the woman on top posture, and was waiting for the happy days of fucking...