POV: My wife's sister found out a little secret

I was just home alone and enjoyed watching the video that my wife's sister was making for her channel. But I didn't even know that she came to visit us and is now at our home. I was just jerking off to her video when she came into my room to get the car keys. She was curious about what I was watching there, and she was shocked when she found out that I was watching her video. I told her a lot of compliments and she decided to stay for a couple of minutes to enjoy this video with me. What happened next, see for yourself.