Getting caught on someone else’s couch

This was years ago now, but one night I had gone out with two of my female friends at the time. After I night of drinking me and the one girl start to dance and flirt a bit at the club were drinking at. We then go over to her friends house that we were out with. After a couple more drinks the one friend that’s house were at ends up on the phone talking to someone in the other room. The girl that I was dancing with started to make out with me. Shortly after my dick was out in her mouth, with me laying back on the couch. With her friend still on the phone in the other room, she decided to get on the couch on her knees. I lifted her skirt pulled down her panties and slowly slide my cock inside her. After a few minutes of clapping her amazing fat ass we heard a noise, looked behind us and caught a glimpse of her friend running back to the other room. Not sure how long she was there for but with the angle we were at she must have got a good look of me sliding in and out of her friend. We wrapped up at that point, sadly without either of us finishing. But we did make it up another time or two