My wife asks me to help her with a friend that needs help

My wife is a nurse that works in a Gynecology section of our local hospital. She has a Masters in Biology and knows a lot about the problems that some people have with sexual encounters.

She has a close girlfriend named Cindy. She is really nice and she's very attractive. She is married to Todd who I also know and he is also a very nice person. We interact with them socially.

One night after dinner out of the blue my wife asks if I will assist her helping Cindy with a problem that she is having. I say nothing but continue to listen. Apparently Cindy has come to my wife seeking her help because Todd has been hinting around about wanting to have anal sex. They have never tried it. Cindy is interested in trying it too but doesn't want to have it be an awful experience since neither her or her husband know exactly how to go about it.

If I agree, Cindy will come over tomorrow, without telling Todd, to get a lesson on anal sex. My wife needs me to play the part of what you might call a male model to give the lesson of sexual technique of having anal sex. My wife and I have done it, but infrequently. For us it's a change of pace and we both enjoy it. I know this sounds crazy but I agree to help.

Cindy is aware that I will be helping. She doesn't consider it cheating since she is doing it for Todd so they will both enjoy their first attempt which they are planning for this coming weekend.

When Cindy arrives she gives me a kiss on the cheek and thanks me for being nice enough to help her. My wife takes Cindy with her into the bathroom to prepare her. I don't know exactly what they are up to and I don't want to know. My wife tells me to take off all my clothes and wait on our bed. I comply and have a ball game on the TV. My wife and Cindy eventually come into the bedroom. My wife is still fully dressed but Cindy is nude. And what a body she has. Her tits are magnificent. Just the right size with tan nipples. My cock is already getting stiff.

My wife tells me to stand at the side of the bed. She tells Cindy that they have to get me in the mood. So they both kneel before me and start sucking my cock. After a few minutes I tell them to stop or I'm going to come. As they get up Cindy complements me on my cock. She says that the length is about the same as Todd's but my cock is thicker.

My wife tells Cindy that the best position to be in to enjoy anal is with her feet on the floor bending over the bed. She next takes a pillow and positions it under Cindy's stomach so her asshole is positioned correctly for penetration. Cindy gets comfortable and my wife says Joe (that's me) is going to start lubing up your asshole. He will initially probe you with just one finger. I'm slow and deliberate as I probe her tight asshole. I ask her if she is OK. She says it actually feels strange but in a good way. I tell her that I'm now going to slowly insert my thumb into her ass. After I'm 2 knuckles deep with my thumb I tell her we're ready to insert my cock.

I do ever so slowly first getting the head in. Then I withdraw a bit and slowly push in a bit further. I ask her again how she is doing. She seems to be liking it. I finally get the full length of my cock into her ass. My wife tells her that this very slow insertion is key and she needs to make sure that Todd does it the same way.

I now start to slowly thrust my cock in and out of her. My wife checks her again making sure that she is OK. Now my wife tells her to move one of her hands down to her clit and start rubbing it. Cindy has already told us that she cums quickly when rubbing her clit. I continue my slow thrusting. In just a minute or so Cindy is moaning and cumming. She tells my wife that it felt wild cumming while a cock is in her ass. This was the whole point of the lesson. Getting fucked anally will give a woman a whole different type of vaginal climax.

I now whisper to Cindy that I am getting ready to finish. I ask her if she's ready. She starts rubbing her clit again. I have a firm grip on her hips. She screams "faster...faster". I pick up the pace. She starts grunting and moaning and cums again. I can't take it anymore and I explode shooting stream after stream of my cum into her ass. Exhausted I rest my head on her back. She says that was great. I compliment her on what a great fuck she.

About a week later my wife tells me how Cindy told her all about how great her anal sex went with Todd.