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I was 15. I was home from school early one day when I got in the house I didn't think anyone was home. I had always let my dog, a rottweiler, lick me anywhere he wanted to when I could. He LOVED cum so much, he could lick my dick for hours if I let him just to get cum out of it. Well when I got home I took off my clothes and let him work on my asshole, he loved to rim there too. Well suddenly he decided to try and mount me and I realized what he was doing and freaked out a little, but he was still going to try to do it if I was on all fours, he wouldn't stop. He tried to hump my head and I wanted to blow him but he wouldn't have that. He went back to trying to get on my ass so I let him and it was a huge mistake.
He went ALL the way in right away, hurt so fucking bad I screamed. But I couldn't just shove him off and he was swelling inside me until I was trapped. I was screaming in pain when I heard a door open to the kitchen and my dad came. It was the most horrible moment in my life. My dad was freaking out too but he bred dogs too and he knew you can't take the knot out and was trying to keep me calm and keep us butt to butt. He put cold water on the dog's tie but that didn't help much... He just sat there with his son tied to his rottweiler. I was dripping with cum yet I was so shocked and embarrassed I didn't enjoy it at all.
We never talked about it directly until I was 17 and he made the comment I was a "young prodigy" at anal sex and laughed. I asked "what do you mean" and he said "you know what I'm talking about anon..." I was stunned and couldn't think of anything to say except "I'm sorry" and he told me it was okay gave me a hug and asked me if I recovered completely, I said yes and he asked "did you ever do it again?" "No" I said and he said "don't lie to me." He looked like he was finding this very funny while I was blushing. He gave me a headraz and that was the end of that but later that same month he was home from being drunk. He never stopped liking being naked in the house but this time he was naked on the couch, petting our dog, and holding a camcorder.
He told me I should lube up and stretch this time. I told him to fuck off he was drunk and scaring me but he was scary when he was drunk and now he was very scary. I did it and he started recording and told me to play with the dog. And yep, he remembered his training and started fucking me right infront of dad and the camera. I won't say I was an expert at this but I had taken the knot correctly a few times before and I got knotted with him now. Dad filmed the whole thing and he was jacking while doing it too. He took sloppy seconds and fucked me afterwards too. So now we've got a system, I'm his occasional bitch and he doesn't expose me. Doesn't matter because that video was the hottest experience of my life.