Wife looking for some Lit recommendations! Wife swap stories ?

Looking for some swapping and swinging stories. I would love to find a series that is longer with a lot of chapters. Maybe a wife swap story, where the wife and her new lover have a better connection than her and the husband. Or vise versa with her husband and the other wife. Stories where it’s innocent at first but turns to something more. Or any other fun recommendations you have! Love the long. Slow burns. With huge payoffs :) If you know of any or want to write me your own story! Reach out :)