Is it true
 

We've all heard the stories of husbands who have lined up a guy with a huge dick to fuck out wife and he stretches her vagina completely out of shape, and then for us guys that have always fantasized about getting sloppy seconds, we climb aboard our wife and sink in our normal sized cock, and there is little or no friction because she is so stretched out.

I know the elastic nature of my wife's vagina, so just wondering if the stories are true , or just that; made up stories.

My experience
 

While we haven't played out your scenaro, I have a pretty wide cock and my wife reports that after period sex, she is too stretched out to use a tampon.

It shrinks back after a few hours.

So I guess you would have little friction from the combo of the big cock and slimey load acting as a deep lube.

yep its true and I think it depends on the lady on how much it goes back and how soon...

Is there any truth to the stories that someone with a very large girth could stretch your wife's vagina out enough that it might not shrink back enough to still satisfy one of us of normal sized guys?

i would say for sure.... I speak from experience

How can I answer without bragging? For me it's almost always been a snug fit and I've literally gone inside her uterus. While I do know my wife's pussy has changed several times over many years from having three children and our many years of sharing hers for masturbation by many men, I can't remember it ever staying too loose except after the third baby.
Yes, of all the games we've played, my wife never let another man fuck her..... until after joining OCC.
But getting back to the third baby and the large pussy, we made games of inserting larger things into her pussy. A very large cucumber and most of a soda or beer bottle were the largest we can remember. This was the time period when I really expected her to beg for other pricks. But she seemed to have never ending craving to be fingered. I still don't remember it being too loose for me for intercourse or anyone to enjoy inserting several fingers for hours. It basically remained large yet plyable.
Over time her pussy returned to being almost as tight as in her twenties. For us I suppose it was her constant orgazms keeping it lubed. Now it's way too tight from old age and lack of use.
But I guess this wasn't the right answer. We had several GF playmates also while very young. Mary had a pussy that I and others could insert a fist almost to the elbow. Yes it was large and sloppy. At the other end of the pussy size thing Charlotte's c*nt was so tight i could never get the head of my prick in. Yes I tried for years. A few fingers and her boy friend's little pecker were all that fit.
We have seen pussys and butt holes that were large open holes that appeared to have been well used and permanently stretched.