[FFM] My wife used me as a sex doll to educate her friend about sex

My wife has a friend, Cindy, who she has know since grammar school. I got to know Cindy in social situations. She was a nerd. And I don't mean that in a bad way. She is super smart and has a great job. But she never had much success in her love life. Just a few months ago she met a guy named Todd. I had met him a few times. A perfect match for Cindy. Another nerd, but a great guy, and also super smart.

After dinner one night my wife tells me that she needs me to help her with something. She proceeds to tell me that Cindy is a virgin which comes as no surprise to me and that Cindy and Todd have it all planned out to have sex for the first time this Saturday. Cindy is going to come over in an hour and she wants me to sort of give her lessons about sex. She doesn't want to come off as a clueless nerd when she finally has sex with Todd.

I'm confused. OK I get it but what does this have to do with me. She tells me that she needs me to show Cindy certain things she needs to know about how to have sex so both she and Todd enjoy their first fuck rather than them both be disappointed because they don't know what they are doing. Apparently Todd hasn't had sex before either. I agree on one condition. "At the end of this little sex school session, am I going to cum." She says yes, but please just go along with the way I have it planned out.

Cindy arrives and she is nervous. She thanks me for helping out. She is enthusiastic about learning. The three of us go to the bedroom. My wife is directing the action. After all it is her idea of how to show Cindy how everything works.

She directs me to simply stand fully clothed in front of the bed. She and Cindy are still dressed. She and Cindy kneel in front of me. She tells Cindy that this is a good way to start. I need you to take down Joe's pants and underwear. She struggles a bit undoing my belt but quickly has my jeans and underwear at my ankles.

This is the first time Cindy has ever seen the cock of an adult male. She comments on it looks sort of limp. My wife tells her when I start working on it it will quickly grow in length and hardness. She says watch how I do this and then you are going to try it. She starts to suck me off in her usual way. Then it's Cindy's turn. Cindy comments how quickly my cock doubled in size. With my wife instructing her she now is sucking my cock and licking the underside of the head. One hand is stroking the shaft. The other is massaging my scrotum. My wife keeps stressing that the most sensitive part is under the head make sure to keep licking it.

I'm almost laughing because this whole thing seems so absurd. My wife tells Cindy, "OK you seem to understand how that works now let's move onto actually fucking." My wife strips off all her clothes and instructs me to do the same. She tells Cindy to stand at the side of the bed. She lays on her back and tells Cindy there are multiple positions but let's just master the most basic one for now.

"Just watch how it works and ask any questions that you might have". First get comfortable on your back and spread your legs. Todd is going to get on top of you just like Joe is doing to me. Now watch how I grab Joe's cock and guide it into me. Make sure to tell Todd to go slow. It's going to hurt if he tries to shove the full length of his cock into you as soon as the head is in. Watch how Joe does it. And I at this point I slowly enter my wife's pussy.

I slowly am thrusting away and simply ask my wife, "So am I supposed to cum in you now?" She says no we'll get to that later. Cindy seems mesmerized watching my cock go in and out of my wife's cunt.

My wife tells me to stop because we are going to do something different now. I withdrawn and my wife now is laying next to me on the bed. She tells Cindy there's one more basic lesson for you. You need to understand how a cock ejaculates. Cindy still has her clothes on but is sitting on the other side of me as I lay naked on the bed with my stiff cock.

My wife grabs my shaft and starts giving me a handjob. She tells Cindy now you take over. "Go at a fairly rapid pace as you pull on his cock. Eventually Joe will tell us he is about to cum and never ever stop till he tells you that he is done. If you stop after he starts cumming you will ruin his organism."

I'm getting hot as Cindy is now throttling my cock. My wife points out to make sure you have the head pointed at Joe's stomach. That's where we want his load to land. I'm finally ready and start shooting streams of cum. As per instructed Cindy doesn't stop till I grab her hand.

Cindy starts laughing and says wow so that's what it looks like when a guy cums. My wife says we are ready for the last lesson. With her finger tip she grabs a glob of my cum and puts it in her mouth. She tells Cindy that most women don't like the taste but she is OK with it. "Now you try it". Cindy is hesitant but also scoops up a bit of my load and swirls it around in her mouth. "Not great but not awful." My wife says just keep this in mind because there will come a time when Todd will want you to blow him and cum in your mouth.

I finally say, "Hey if I'm done now I'd like to get dressed and watch the ball game." My wife says, yes we are all done. Cindy thanks me again for helping her out.

Several days later my wife tells me that Cindy really enjoyed Todd fucking her and asked her to thank me again for teaching her how it all worked.