Three days of relentlessly training my sister into a reverse bunny after reversing our power dynamic using my authority as her older brother! Normally, my younger sister looked down on me, treating me like an idiot—a perfect, modern schoolgirl excelling in both sports and studies, ignoring me completely whenever our parents were away. This time, I used my position as her older brother to the fullest, forcing her into a reverse bunny outfit and strict discipline. At first, she reluctantly served me, but after repeated creampie after creampie from my inexhaustible cock, she gradually transformed, crying out, "Onii-chan... I'm coming... Master!" Exposing her slender neck, small breasts, and big ass completely, she kept coming over and over for me. From now on, she must never defy her master again.