Well mine is Accidental Hotwife and describes almost exactly your fantasy. https://www.amazon.com/dp/B077MNZL5R/ Another author you might check out is Arnica Butler. Her book A Conventional Hotwife also partly describes your fantasy. https://www.amazon.com/dp/B01LQYPUBW/ Max Sebastian does a good job with his writing. I'm pretty sure he has one too, but I can't think of the title off of my head. The same goes for Matthew Lee. I hope that gives you some titles to start with. If I think of more I'll come back and post another comment for you. Have fun!! :))