My wife Cheryl and I had been married for 26 years and our sex life was down to once or twice a month. We had tried various ways to bring more excitement to the bedroom but nothing seemed to work. We brought various sex novels to bed and we liked to read them together. But the only ones that seemed too get her hot were the ones where women had sex with animals.

While we were reading them her pussy would get wet and swollen and she would have me finger her to orgasm. Sometimes she would get excited and have me take her doggy style and pretend I was a big dog. I even borrowed a dog from a friend but she wouldn't even think about messing with it.

But things changed one weekend when we went out to my brother's house for a swim. He has a house on 15 acres and has a pond that covers almost an acre. We had been swimming for about an hour and were lying on the deck on some lounge chairs. My brother has several dogs, but only one of them is not fixed. His name is Duke.

Duke is a large mixed breed dog with a rather large penis. I always carry a small tape measure on my keys, and when he had an erection I checked to see how long and how big around he was. He is a little over 10 inches long and almost 3 inches around. Where his knot is he is over 5 inches around.

We were lying on the deck chairs, and I had been playing with Cheryl's pussy. She was wet and had her eyes closed while I fingered her. All of sudden Duke, who had been sniffing the air near her pussy, came over and without any warning started to lick her pussy. Cheryl had on a one piece suit so he couldn't get to her pussy, but was licking her thighs next to her pussy.

At first she didn't react, but when she opened her eyes and saw Duke she yelled at him and he jumped away. Duke moved away and sat there with his penis hanging out about 6 inches, all red and slick with his juices. Cheryl saw it, and since she had never seen a dog with an erection thought he had hurt himself. When she said that I laughed and explained how a dog kept his penis in its sheath till it got hard.

Then she asked, "Did he get that big from licking my pussy through my suit?"

I said "Yes, and just imagine how big he would get if you let him lick your naked pussy."

Cheryl has real nice round tits, and her nipples are almost an inch long and as big around as a man's thumb. As she looked at Dukes penis her nipples got hard and were standing up.

She bit her lower lip and asked, "Would you get mad if I let him lick my pussy?"

I said "No, go ahead."

To my surprise she stood up and took her suit off. Cheryl has a very hairy pussy, but she keeps it shaved down to just a racing stripe.

I should explain that the pond is in a grove of thick trees, and there are no houses around for several miles.

Cheryl lay back down and called Duke. Duke ran over and started to lick her very wet pussy. I got down next to her and watched as he really started to lick up every drop of her pussy juice. Cheryl was pinching her nipples and pushing her pussy against his nose and softly moaning how good it was.

I reached down and took my fingers and spread her pussy lips apart so Duke could stick his tongue inside her pussy. When he did this it was like someone had stuck a live wire in her pussy. She wrapped her legs around his neck and grabbed his head and pulled him into her pussy. Duke acted as if he couldn't get enough of her pussy juice and kept licking till he found her clit. Cheryl has a larger than normal clit that stands up most of the time. She wears a pad in her panties, because if she doesn't she'll get a wet spot in her pants.

When Duke found her clit, it was a good thing we were out in the woods because she started to scream. She wanted the whole world to know that her pussy was on fire. All of a sudden Duke jerked away from Cheryl and jumped up and tried to fuck her.

Duke's penis was fully erect and so hard it almost seemed as if you could cut glass with it! He tried to stick it in her pussy, but it was going up and down between her swollen pussy lips. While he was doing this he was hitting her clit, causing her to cum so many time I lost count.

Cheryl suddenly reached down and grabbed Duke's swollen penis. Using it like a dildo, she put the head into her swollen pussy. Now I don't have a giant penis but I'm almost 8 inches and have a large head on it. But when Duke's pussy splitter entered her Cheryl, it was going where no man had been. It was almost as if Cheryl was a virgin again.

Duke drove his huge cock into her with one lunge and was all the way up to his knot. I didn't think Cheryl could take his knot the first time, so I grabbed his penis to keep the knot out of her pussy. Cheryl wrapped her legs around his body and started to fuck her pussy right back against his big cock. His penis was very slippery and I lost my grip, and Duke slipped his growing knot into her pussy. Now he was balls deep in her and fucking her like a rag doll.

Cheryl said, "Oh my Lord! He's swelling up in my pussy and it feels so good!"

Duke's sheath was rubbing against her clit, and she was out of this world in ecstasy. All of a sudden Duke let out a growl and a whine and started to fill her pussy with his sperm. His penis had swelled up so much that he couldn't pull out of her pussy, yet sperm still managed to squirt out of her pussy running down the crack of her ass.

To my surprise Duke's penis didn't go soft, and he laid his head between Cheryl's tits and close his eyes and took a break. After about ten minutes he started to fuck Cheryl again and they were off like gang busters. Duke has great stamina and he kept fucking Cheryl for almost an hour.

Finally he went soft enough to slowly pull his penis out of her pussy. With a wet, sucking noise it slid out and hung down under his balls. His penis was still swollen larger than most men's, and he lay down and started to lick it clean. Cheryl's pussy was still gaping open after that huge cock spread her open, and sperm and pussy juice was running out.

I couldn't help myself: my cock was harder than it had ever been and I just had to fuck her. I noticed immediately that she was a lot looser, but it didn't matter. I came like a fire hose after just a dozen or so strokes.

Cheryl just lay there rubbing her nipples with a big smile on her face. I got some water from the pump and gently washed her pussy. After I got her cleaned up, I helped her get her suit back on. She slept all the way home. She had douched her pussy several times, but it was still several days before she got all of Duke's sperm out of her.

This happened several years ago and now we have a male black lab named Jake who fucks Cheryl almost every day. Several of her friends join her. It's amazing how easy it is to get a woman to fuck Jake after they see his huge penis.

Cheryl found a friend that does yoga, and has taught her to tighten up her pussy muscles so I still can have fun in bed with Cheryl.

Thanks to Duke best friend, I have a wife who is always horny. The dog truly is man's best friend.

The story was edited by Robin.