Watching a movie with my sister and at the end I fucked the naughty girl

I was having a good time watching a horror movie when my wife came in and wanted to watch it with me. She got really scared and asked me to hug her. As soon as I felt her ass touching my cock, I got really horny. And luckily for me, my sister is a naughty girl and ended up giving it to me, I fucked her on all fours like a dog in heat.