Intense doggystyle with my BF's sis while he's away

The other day, my buddy's sis came over and she was all bent over on the couch. I figured it was a perfect opportunity to slide my big ass dick right into her tight ass. She was totally down for it, and we started going at it like wild animals. Her friend was cool with it, and even joined in, giving me a nice blowjob. Things got pretty intense when my buddy came back and caught us in the act. He was totally cool with it and even got in on the action. We had a wild time, with his sister taking turns with his girlfriend. It was a wild ride, and I hope we can do it again soon.