When I was 12 truth or dare led to me having to let our family Golden Retriever hump me. I was wearing only undies and a shirt and I felt the bone hitting the mark even though he couldn't put it in. But every time it hit by butt hole it sent a kind of this amazing shock up my spine. I really wanted to feel that again.
A couple of weeks later I was home alone and got the dog to mount me. Wearing only undies I got the idea to take them off thinking it would make the feeling more intense. I didn't know how dogs mated though and didn't know about the knot yet.
When he went in he started humping his dick went inside me and he then started humping really hard. The sudden intensity scared me so I stood up. I remember I felt really guilty. I ended up with two really big scratches on my sides and legs from his dew claws and this actually almost got me in trouble. My brother noticed the marks and told my mother who then started asking how I got the cuts but I made up some lie. Between fear of being caught and guilt of letting the dog put his dick in me I didn't try again for almost a year.
By then puberty was starting and I always got hard every time I thought about him in me. The first time I came I was fantasizing about the dog humping me and going inside and a light bulb went off that I wanted to try letting him mount me again. I still didn't know about the knot - I just thought he would come and then get off me. The thoughts were overpowering though and I knew I was going to let him finish this time.
I came home from school one afternoon and everyone was out with a note to make my own dinner because my mom had to take my brother to a football game in another town. My dad wasn't usually home until after 6 and that would have been a few hours away, so I took my clothes off and started playing rough with the dog.
Ever since the first time he mounted me he was always quick to try but I didn't present my butt to him right away. I wanted to see if I could get him to lick my dick, which he did and it felt great. But I was also nervous as fuck about letting him mount me but eventually I did. A few times he got it in me but I chickened out, then would jerk off and after coming decided not to. As a horny as fuck teen though I would try again.
I remember super clearly when it happened. I am a lot older now and that dog died of old age years ago but I fantasize about this night a lot, even when one of my current dogs are fucking me.
I kept telling myself to not be a chicken. I told myself to let him go for fifteen seconds, then thirty, and a minute, but I still didn't know about the knot. So he fucked me for fifteen seconds and I stood up... Walked around the room, got up the courage to let him go for thirty seconds. I can still hear the sounds of his hips smacking against my ass and feeling his balls swinging under and smacking my balls.
I was watching the clock to make it to thirty seconds and then I felt him getting bigger as his dick went in and out but before I could change my mind he was still humping me but he was stuck inside me. I had no idea what the hell just happened but fuck it hurt and felt really good at the same time. I didn't know what knotting was then but he had me tied.
Then he turned around and we were ass to ass and I seriously thought we were stuck like that and my family was going to come home and find us. I was scarred as fuck the whole five or ten minutes we were tied but then he pulled out. That part hurt a lot actually.
After this I thought I broke the dog.
Not sure how long it was but I eventually found a book in the library about dog mating and learned about the knot and such. It was probably six months or more before I let him in me again but by the time I was in 8th grade it became a regular thing and lasted until I left for college.
I was also gay and out in school but I don't think my family or the boys I dated in school knew I also liked getting it from dogs.
My husband now knows and doesn't really approve but doesn't say anything as long as I don't involve him in it.
I am very happy how this turned out in my life. I imagine it would have been a lot worse if I were born even ten years earlier considering how horrible the last century was for gays and all.