This happened 8 years ago me and the girl I was dating were at one of her friends places. There was 7 of us partying having fun, all open minded and kinky., Well I had let my girl tie me up to the coffee table and two of the guys had fucked me and my girl and two other girls had pegged me a bit. A few of them went to go smoke and I was left tied down, someone didn't close the door properly when they went outside and the home owners shepherd/rott mix got in the house and found me. I tried shouting as he started licking my ass and before I knew it he mounted me and I kept shouting till he finally found his mark and rammed in me. It was uncomfortable at first and his claws hurt, but the longer he went the better it got. Finally everyone came back in and saw what was going on but they didn't stop it instead one of the guys made me blow him while I was getting fucked. The rest recorded and took pics and watched, when the dog finally came it swelled so big in me and was stuck in me for almost 20 minutes. Before the night ended I took a round two with it for everyone but the second time I wasn't tied up and after it knotted me and was stuck my girl decided to shove a dildo in me with it.