I, the older brother, was chosen by my younger sister, who recently debuted as a gya (a type of sexy girl), as her sex practice partner. Lacking sex knowledge, the two of us engaged in a frenzied, double-banging penetration. Kuramoto Sumire BLK-630

She decided to become a GAL (gay adult film) sister. To become a sophisticated and sexy woman, she decided to undergo sex training! And her chosen opponent was none other than her brother! Although I've watched AVs, I have no actual experience... but if I don't do well that day, it would be embarrassing and affect my brotherly authority, so my sister and I did thrusting training together! Perhaps because of our blood relation, we were incredibly compatible! Even our stamina was inherited! Even though neither of us knew the other had orgasmed and we were still ejaculating, we still went on a double-bang thrusting spree, ejaculating a lot inside each other!