My first time happened innocently enough I was 16. Home alone and masturbating in my room one day and i didn't get the door closed properly my bulldog rocky came in and jumped on the bed, being close to cumming I didn't stop, ignored him and finished as I lay there I feel a tongue across my thigh before I could react he had licked my balls which surprised me...it felt good don't ask me why but I let him lick it all up then I began to wonder what it'd be like to have him on top of me maybe he would even fuck my hand if I held him behind me, my inexperience was my downfall not knowing how strong he was I let him mount I still don't know where the urges came from, I kept thinking its OK no one will know...I'm just paying him back for the licking, but when he started humping i lost grip on his penis and it slipped right in my ass, still early in his erection he slipped right in knot and all and began fucking with all his might. My mind was blank all I knew was that this felt good I was really enjoying it. As I began to cum I felt his penis swell and jerk and the flow of his semen felt like it doubled and I knew he was cumming as well...felt amazing...he stayed mounted ...it was a life altering moment...Me a straight teenage male just had a mutual and concurrent mind blowing orgasm while having anal sex with my dog I struggled with it and still do but as I said in my previous post (erased on accident) I went on to have over 200 seperate encounters with 26 or more male dogs over the years. Ask me anything...only wish to inform and help those like me...men or women.

Edit: Changed a few things after I gave it more thoughts thanks for the comments fell free to pm if open comments aren't where you are comfortable.

Side note: a friend said this sounds like I'm a serial fence hopper...I admit the number is high but I assure you i was well acquainted with each one, I lived near a place where my land lord kept many dogs. He was a vet I lived there for years and many dogs came and went, for many of them I was the only one who paid them any attention at all, and it never turned sexual until more than ample comfortability was achieved I never forced or tried more than once with each.