Wife and I have been eyeing on one of my coworkers for few years now. But never suggested anything to him, as we have this rule that we won't "have fun" with eachothers friends, coworkers or friends.

Well, this rule went out from proverbial window soon after the said coworker met my wife IRL. 
It wasn't even anything planned from out part, we went out on my company's "refreshing day".
Talked with people there, drank some drinks and ended up talking with the guy we've talked about few times or "eyed him" in the past. Of course my wife had only seen him in the pictures and in few workrelated online conversations, where he had his webcam on.

Suffice to say, Wife was impressed of him, as he's handsome, tall and wellbuild black guy, who can also behave and keep up a conversation more than few minutes. Also, she happens to have her "black guys are hot"-phase going on (has been going on for few years at least now..)

Anyway, from the company even we (Wife, the guy and I) went to restaurant to have a lunch, where we could talk more privately and  in more relaxing environment. My wife and my coworker got along really well and there was even some light flirting between them when I was in bathroom (wife told me).

From there, we went to a club - we were not in hurry, as the children were in granparents care - We got pretty drunk there, but luckily not too much to not to be able to dance and have fun. 
The coworker was pretty enthusiastic dancer, so he danced a lot. Alone and with my wife.

While dancing with my wife, he was a bit handsy, especially later in the evening, when we were more drunk, there were more dancers on the floor and they both were more relaxed with eachother.

Last few songs were slower ones, of which I danced one with my wife and the coworker danced two last ones with her. I don't know which one of them started it, but I saw them kissing during their dancing and caress eachothers bodies over and under the clothes. He was especially intrigued by my wife's ass and breasts and my wife was in no hurry to stop him.

After the last dance ended, my wife pulled my coworker after him towards me, holding his hand and told me "I want him."
I had no time to reply, as she pulled him along and aimed to the front door.

We took taxi straight away, I sat at front and they sat at the back. Didn't peek, but I could hear my wife's soft gasps, moans and wet kisses. 
For some reason I decided to act as if they were the couple and asked the driver drop me off at one convenience store, allowing my wife and coworker to go to our place together.

Took me good 30 minutes to walk to our home and once I arrived, I found bunch of clothes beside the front door and more clothes in corridor before our bedroom. I really didn't have to guess what was happening, as I heard everything from the frontdoor already. They were fucking, hard.
Our king sized bed was making  disturping noices, almost as if it was breaking under them.

My wife screamed, moaned, cried and yelled, as the coworker fucked her with his "Big Black Cock" as my wife descriped it in throes of passion. Unfortunately she or him had locked the door so I could only listen to them. I wanted to watch, but I also didn't want to bother them, as they were obviously having such a great time.

I don't concider myself as a cuckold, as we both are allowed to have fun with other people openly. But as I listened my wife being fucked by this black coworker, I was hornier than ever before. I probably wanked 5 times during the night, as I listened to them. First from the corridor and then later from living room, as I tried to get some sleep.

But they didn't sleep before morning. Only times they stopped, was to get something to drink or to have bathroom breaks.
They slept far into afternoon and after they came out from the bedroom, they were completely naked. My wife had red cheeks and burning red ass, as if he had slapped those cheeks until they were bright red. Well, in a way, he had.
Wife also had all kinds of marks all around her body, as he had sucked and bitten her all around. Especially large hickeys were decorating her neck and right breast.

Also, her naturally perfectly setting dark hair was now one big mess.
And what comes to HIM, well, I understand why my wife was so wild with him. Sure, he's good looking, at least half a head taller than I am and he has well build, sporty body. But the thing he has between his legs impressed even me - and I watch a lot of porn, with and without my wife.
That THING between his legs is around 30 cm (or 12 inches for those who use only imperial measurements) and scary thick. Of course that's only questimate, as I'm not going to take a tape and measure it. Although my wife might...

 If I had known his effect on my wife, I probably wouldn't have spend the evening with him with my wife. Because she was completely sold and haven't talked about much else in private with me, than how wonderful my coworker is.
I'm not jealous, but I'm a bit scared that we are going to have another dark skinned baby, if she "forgets" her pills with him at some point.

But, even though I have my reservations, I have never seen her have such a passionate relationship with any of her lovers.
And it's almost hypnotic to watch them together, although I can only watch them, when they fuck at our place. As he doesn't want me to be there, when she's visiting him at his home.
Well, at least children are happy as they can visit granparents more often now. "Mom and Dad have things to do..."