My gf, her sister and myself have all masturbated once while watching a porno. We all had been out one night, we were a little tipsy but not drunk. I started it by putting it on for a joke I'm 31 my gf is 30 and her sis is 26, I asked them if they wanted to watch something fun, they agreed so I put on a gang bang porno. I was sat between them and when I got hard my gf unzipped my jeans and pulled my cock out, I started masturbating, her sister started watching me and lifted up her skirt and started fingering herself, my gf then did the same in the end we were all watching each other and not the porno. When I was about to cum I grabbed my gf by her ponytail and put my dick in her mouth, it was a great orgasm, her sis orgasmed soon after seeing my gf suck me off. Then we watched my gf make herself cum. Her sis then left the room and went to bed, we fell asleep on the couch. Nothing has been mentioned in the last week. I'm going to bring it up again soon.