My first Dog fuck

I was divorced and not in any relationship and was asked to look after a friend's dog. I was living in a room rental a day-by-day basis, till I found a more permanent place. They were going on a 3-week trip, and I could stay at their home and look after their dog Shep a large friendly dog. I agreed as it was better than what I had, I moved in 3 days before they left, so Shep would get to know me. They left and Shep was a little down at first but was soon keeping close to me. I'm well off financially and was searching for a place to buy and nothing that took my interest was available at the time. Anyway, I do exercise often at home and had been sunbathing and so showered and then decided to exercise. Rolled out my exercise mat and didn't bother to dress after my shower, while exercising Shep started to take close interest in me. At first, I thought he was wondering what I was doing. Turned out I had aroused him, and I realized that when he started sniffing my vagina. But I told to go away and at first, he started to walk away. But turned and started licking my vagina, I was at first shocked and was about to tell him off. When I realized I liked it, I was getting aroused myself and decided to let him get me off. Which he did, but then he tried to mount me and failed the first time and so he tried again and got into me. I was a little shocked, but let him go as they say, and he rode me hard, and I really enjoyed him fucking me. This became a regular thing between me and Shep for the remainder of my stay. My friend's return and they had decided to move closer to their grandchildren and downsize to an apartment in the next state and I liked their cottage and bought it off them. The apartment wasn't an ideal place for Shep, and their son's home was suitable for a large dog like Shep. I said I'll take him if you want as we were getting on very well. So, I got my new home and a dog at the same time, that was November last year and Shep keeps me very well serviced. He is easy to please and never whines like a husband does. Perfect relationship for 54-year-old divorced woman, my children have visited me and Shep stays in my room at night, and we fuck then or when they are out. My secret lover is my closest companion.