Reversal of roles! I turned my cheeky sister into a reverse bunny and made her understand, and spent 3 days cumming inside her! My sister is a modern high school girl who is good at both sports and studying, and she always looks down on me, so while our parents are away... I took full advantage of my power as an older brother and made her into a reverse bunny slave! At first she reluctantly served me with a disgusted look on her face, but when I continued to cum inside her over and over again with my super-strong dick, whose hobby is masturbation, she said, "Big brother... I'm cumming... Master!" I easily completed the training. I made my sister cum over and over, exposing all of her embarrassing parts, including her slim waist, tits, and big ass! ...You can't disobey your master anymore!