A funny  incident that happened about three months ago:

My wife and I went over for a BBQ and a swim with another family. All afternoon the kids were in the pool but finally  at sunset Mum herded them away upstairs locking the door saying "now its the grownups turn to play". Oldest Boy was about 16. Surely he must know whats happening...?

After a few drinks Mum (D) comes out in her  string Bikini. She's a BBW and and the Bikini is tiny, she's spilling out of it all over... Wow!  My wife  also looks amazing in her  Bikini, but shes more of an athletic build so it covers most of what it was designed to.  My cock is rock hard looking at the pair of them.

So we frolic in pool fifteen minutes  but it starts getting cold so we all get out of the water and dry off. He (T) is massaging my wife's neck  so I finally get my hands on the awesome looking BBW, slipping my hand under the fabric of her small bikini briefs and running my fingers  lightly up  and down  between her buttocks as I kiss her. Her mouth tastes good, of whatever liqueur she was drinking. We kiss for a bit as I hold her buttocks and enjoy the feel of her heavy breasts against my chest. T and my wife are doing something similar close by.. I hear them giggling.

After kissing  and petting for a while we move indoors. My wife and I felt initially awkward knowing there were kids somewhere in the house (it was a big house, 3 floors),  but we were assured it was fine and an interior door was locked. One of the couches in the lounge was a sofa  bed... Tricky eh?

Mrs BBW virtually exploded out of that Bikini when I untied it. She laughed and said she hadn't worn it in years and that it had become a little small. I told her it looked perfect for her: I meant it. The evidence of that was the state of my cock when I stepped out of my swim shorts... 

D lies back on the bed, pulls her knees up and her smooth waxed cunt looks so inviting that  have to go down on her. Her  creamy cunt juices taste every bit as good as her mouth does. I'm massaging her heavy breasts with my hands as my tongue explores her clitoris. She's very wet now and her cunt is almost dripping...her juice is all over my face: Awesome. The only  minor disapointment came when she declined my fingers entry into her tasty asshole while I lapped her juices. But that's fine...

I am  vaguely aware of my wife  lying naked on the bed beside us and T sitting astride her shoulders. I think his cock was in her mouth, and this made me feel my own swollen cock needed attention.  By the time I got it  into Mss BBWs eager mouth it  felt like it was gonna burst and was nearly as wet and glistening as her cunt had been.

OK,  so we're getting to the cock sucking bit of the story... Stick with me here :)

So my cocks in her mouth, she's good with her mouth and throat and it feels WONDERFUL... After a while I withdraw and D announces something flattering about the size of my cock. Now to put this in context, I afterwards learned from my wife that T was under-endowed cockwise. What she calls a 'Pin dick'. So she was rather disappointed. But as soon as  Mrs BBW announces I've got a large cock,  T  (who's astride my wife beside me) suddenly reaches across and and grabs it. Just grabs it, and wraps his fingers around it, as if gauging its size and weight. I was kinda surprised, because its never happened before when  we've been with  other couples or groups. Then T says "May I?", and I think he's  belatedly asking if he can grab a feel. So of course I say yeah... Then he suddenly  leans across on the bed and takes my cock into his mouth. So are you following this?  His cock is in my wife's mouth, and mine is in his. So I'm kneeling there on the bed, hands clenched with Mrs BBW, looking down at her open cunt and tits and knowing I'm going to have an amazing fuck with her. Meanwhile this guy T, (nah, lets call him Pin-dick),  has my cock in his mouth and is doing a great job. I felt the approach of my orgasm but wanted to blow my load in his magnificent wife instead,  so extract myself. In a moment her legs are over my shoulders, my cock is deep inside her and I've mentally moved on.

Now we jump forward about a month and my wife and I are enjoying drinks at a hotel bar with a  couple of friends. My wife starts telling the story of her evening with 'Pin dick' which ended as a big disappointment . The fact I enjoyed a really amazing fuck that night makes her even more indignant.

Anyway, we're all laughing as my wife tells the story of the  small cock. She's  a very, very funny lady and draws out the story, exaggerating and  gesticulating with her hands to support her statements and indicate his tiny cock size.  I'm sure she's exaggerating for comic effect: Surely it wasn't THAT small?  But we're all laughing hard now as she tells the story of her lousy fuck. 

Then just as everybody was laughing hardest, I remember how he had suddenly grabbed my cock and sucked it when we had all been on the bed together. So I interjected "Hey, did you know that guy sucked me?" My wife breaks her story mid sentence and looks puzzled. I realise she had been so busy sucking him that she hadn't seen him do me, so I told them all  how it happened. And we all burst out laughing again, even harder this time. My wife and her girlfriend fall off their bench and roll around on the ground, literally pissing themselves (wet thongs) laughing and tears streaming from their eyes. 

I guess you had to be there...