Stepfather fucks my sister

I Knew that my younger sister behaved in a strange way, but I was not sure why. And I recently discovered the reason. I was going to be in the kitchen when I heard noises. As I approached, I realized that my sister was in the kitchen with our stepfather. He was sitting on a chair and she was on the floor on his knees in front of him, making him a blowjob. The whore of my sister scopava stepfather. And the most absurd thing of all is that I felt excited. So I pulled on the skirt and I started to jerk off while you listened.