HUNTA-257+ Hiding from my parents, bold incest in the kotatsu! It seemed that my sister was doing homework in the kotatsu, but she relaxed and fell asleep. Since my sister's legs were in the way, I looked inside and saw that she was sleeping with her legs wide open and her panties completely exposed. Although I knew she was my sister, I was curious, so I sneaked in to take a closer look at her panties. As I watched, the devil…