by beachbum72
Your title says threesome, but the story says foursome.
It needs some dialogue and more detail.
"A keeper" isn't a woman that gets you back after being a cock tease for ages by doing a group sex to prove she isn't frigid. That's a divorce for infidelity waiting to happen. Bang the slut all she wants, but don't ever delude yourself into thinking she'll be faithful to you and marry her.
I met my wife when she was dating my friend. One night after a party we went to his place for a night cap. She sat on his lap in the armchair and I sat on the chesterfield. I passed out on the chesterfield but awoke to them still in the armchair but completely naked with her still sitting on his lap riding his big cock. That was the not only the first time I saw my future wife naked but I saw her enjoying riding a very big cock.