My feelings for her began to change during our high school years. In our daily lives, I started capturing my sister's growth through the camera lens. Each time I looked at her through the viewfinder, my heartbeat quickened. I gradually began seeing her not just as my sister, but as a woman—someone I was sexually drawn to. On Maki's 18th birthday, I finally gathered the courage to confess. With our parents away from home, we had a special two-day, one-night stay alone together. From that moment on, it marked the beginning of our journey into adulthood.