I guess I can also answer this question. Even though my dog breeds me from the front and not the rear.
It is pretty awesome. Especially after a few days of sexual abstinence when we are both extremely horny. He circles around me like a shark looking straight into my eyes with his excited "lets fuck" expression. I get an erection just watching him do that.
I sit down and he does his move that means I want sex. I lay down under him and grab his sheath, he then mounts my head and rams his dick energically in my mouth spraying liquids from the beginning.
I know it is going to taste great because he has not had sex for a while. At this point I usually already have wet pants from the excitement.
The rest does not fit into the anticipation part of sex.
I was afraid and also very exited for the first tine. Not knowing how the knotty part will go. But all i know you just need to relax, and you will be drilled to heaven
I was very nervous the first time but my adrenaline made my heart pound. I didn't end up taking the knot but it was one of the most exciting things I've ever experienced! I would love to take the knot one day and be fully tied together. The anticipation of that is killing me already