As a reward for passing my college entrance exam, my sister invited me on a hot spring trip just the two of us! My sister, who loves me very much, has big breasts and is a bit perverted. As she started changing into her yukata, I got an erection. She jerked me off, and we had sex with her taking it inside in the open-air bath. My sister craves my dick, and we enjoyed a loving, intimate moment together！！
