Lonely and Horny

I'm Bronwyn 56 divorced and living alone, my family is all grown and have left home. My ex married his PA and moved to the city, I got the family home as part of the settlement. It's on a large block 5acres and away from close neighbors, my only company is Bob the Great Dane my youngest sons Bruce's dog, Bruce is in the air force and stationed overseas. So I look after Bob for him, Bob is a gentle giant and stays close to me most of the time. A local church washes dogs regularly to raise money for their church needs and I take Bob to them once a month for baths. He causes no problems and they like seeing him, last time I took him he was very quiet and on getting him home he followed me everywhere. After I had been working in my garden I went inside for a shower, Bob followed me and I didn't shut the bathroom and after my shower. Bob was lying on the bathroom mat and I dried myself and then he stood up and started sniffing me. I told him to go away, but he continued and started licking my pussy. I hit him the towel and he left the bathroom and sat in the lounge room, I dressed and went out to the kitchen and made my dinner and got Bob's dinner also. After my dinner, I started watching TV and Bob laid on the floor a few feet away. I watched a comedy with a lot of sexual overtones. I started to get horny while watching it, but I was tired of playing with myself. Then seeing Bob licking his balls and cock, I started to wonder if I should let him have his way and fuck me. I then got up and got a glass of wine and while I was drinking it. I thought about Bob, on finishing the wine I decided to give a try. I removed my panties and got down on the floor bending over the sofa. But Bob didn't move, I called him over and he came after a little while he started to sniff my pussy then licking it. At first, I wasn't sure whether he was going to get me off. But as his tongue found my hole and entered it, I started to moan. Then he tried to mount me and after a few misses, he entered me and started to pump my pussy and I was really enjoying the fuck. I came before he did and had to wait for him to get off me. Since then I have let him fuck me anytime he wants. I even sleep naked as he comes to my bed at night and wants to fuck me and I let him. I'm now his willing bitch.