Caught my cousin masturbating and it ended

I caught my sister masturbating on the bed and videotaped it all. She threatened to call the police on me for being a stalker, but in the end with the video I recorded, she agreed to make me happy. Damn, that gorgeous tight pussy was so wet and ticklish that I couldn't hold it in anymore. After having sex with my stepsister, she was so passionate about my big potato that she wanted to do more but on the condition that she wouldn't tell her parents. I agreed!