One day, I met my best friend's sister, Ito, at the park. After school, while still in my uniform and shopping for dinner, Rui invited me to her house, and after having dinner with her, we decided to stay the night. Then, that night, while I was sleeping next to her, my best friend and Rui started having incestuous sex! As I was peeking at them, I definitely caught sight of Ito, who was climaxing hard while trying to suppress her voice. The next day, I met Rui on Ito way home from school again...