As a shut-in, I enjoy observing my sister in the next room through a peephole in the room. My sister who doesn't notice the hole changes clothes or rolls around in bed. She sometimes masturbates too. One day, when I was looking into it, I started flirting with my boyfriend and developed into H! I can't help but be nailed. Then I met my sister's eyes on the way! But her sister continues H as if nothing happened! What's more, I meet my eyes many times on the way, and my sister who gets excited every time! I feel like I can't say anything...
