Help sister in law with fuck revenge

My sister found out her boyfriend has been cheating on her and wanting to get back at him she asked me to fuck her and let her take pictures of us to give him a taste of his own medicine. Fucking slut! I tried to talk her out of it, but she was very persistent and hot and I was horny, so fuck it! I plowed this tight slurping pussy like a boss and came all over her ass, and you know what? She said she wanted to do it again. Wow!