SZKK-015 No way my little sister... ~Leaked H video of my busty little sister~ R-18/Miyauchi Kaoru

I'm not biased towards family, but my little sister is an excellent student, cheerful, and has many friends. She's a sister I can brag about. One day during the week, in the middle of the day, I heard a man's voice from my sister's room next door saying, "Since no one's home today, it's okay, right?" "I've never shown this to anyone else, so it's fine." They didn't know I was there and were making some kind of request to my sister... Then, I heard the moans of my sister and the man that I really didn't want to hear. After they left together, I entered her room feeling guilty and found a video camera. I had a bad feeling and played it back, revealing my sister in an unseemly state with an expression I'd never seen before.