I have told this story on other posts, but it deserves to be repeated here.
When our daughter was a teen-ager, she was attracted to an older guy, in his early twenties. We were very afraid he would get her to let him fuck her. So my wife and I hatched a plan.
She got him alone and said she's let him fuck HER if he'd leave our daughter alone. He was astonished, to say the least, but the opportunity to get some "older pussy" as he called her, was too good to pass up, so he said "YES!"
So, she brought him over when she was alone and gave him the fuck of his life. He couldn't say enough about how she fucked and asked to come back in a few days, and she, of course, said "yes".
They fucked several times over a period of a few weeks, and he always enthused about "getting some married pussy". But during this time she never told him that I knew he was fucking her.
One day I came home while he was still there. I could hear them fucking in the bedroom but I stayed away until they finished. When he came out and saw me there, he nearly panicked. But I assured him that I had known all about it all along.
He was flabbergasted. He said "You don't care if I fuck your wife?" and I said "Why should I care? She's got enough pussy for both of us!"
He just kept saying "I can't believe it! You let me fuck your wife! You let me fuck your wife!!"
There's a bit more to this story, if anyone is interested.