My entertainment as a shut-in is observing my sister in the next room through a peephole in my room. My sister doesn't notice the hole and is changing clothes or rolling around on the bed. Sometimes she even masturbates. One day, while I was peeking, I saw her boyfriend and her getting cozy and it developed into sex! I couldn't help but be captivated. Then, my eyes met with my sister in the middle of it! However, my sister continued to have sex as if nothing had happened! What's more, my eyes met with mine many times during the process, and my sister came over and over again every time! I felt indescribable emotions...