A great time dog sitting my neighbors Shepherd

I'm not a real dog person, but my neighbors cousin passed away and he had to go out of state and ask if I would watch his Shepherd. I told him yes but I would like to keep him at my house, it would just be easier that way. I've been around his dog a few times and I knew that the dog was one of those that was always humping you. So my cousin left on his trip leaving the dog with me. I took a shower, and set on my couch to watch a p**** and decided to jerk off a little. Before I knew it the dog was up sitting next to me I started putting his nose down near my cock and balls. Then he started to lick around the head of my cock. His tongue was fairly rough but it felt pretty good, I guess the dog like the pre-c** oozing out the head of my cock. And then got on my stomach and arched my back to reveal my a****** and sure enough the dog started licking my a******, this felt tremendously good. As I was laying on my stomach I decided to get on all fours, sure enough he wrapped his legs around my stomach and started humping me. At that moment I thought I wonder if I lubed up my ass if he could get his fairly large dog cock in my ass. I thought I would stroke his big cock a little just to see what happened. I started stroking he really loved it pretty soon there was some white dog c** coming out the tip of his cock. I immediately got up went to the bathroom and got my tube of KY Jelly I put some on my finger stuck it up my ass, then proceeded to put some on his big dog cock. Then I got on all fours sure enough he mounted me again I could feel his hard dog cock probing near my a****** but still not finding the spot. So I reach my hand back trying to guide it into my waiting a******. A matter of seconds he found the spot it was a sensation that I never had before he pumped feverishly for about a minute before I felt his warm semen running out of my ass. His dog cock became flaccid and slipped out, and he immediately started licking my ass again. I guess he enjoyed licking his c** out of my a****** as much as I did. I thought I would try one more thing so I laid down had him come over to me I put his big dog cock in my mouth and start to suck it to my surprise it got hard again, and I sucked it until I started to taste something coming in my mouth realizing it was his semen, I thought what the f*** I'm going to swallow it and I did. Never thought I would be turned on that much by dog cock but I was. I told my neighbor anytime he needs me the dog sit but he was really a good boy and I would keep him. We had a few more sessions throughout the year usually ended up the same way.