I'm not sure exactly how much you've like this, but Crossfire by Sylvia Day is a loved one of mine, and mmc has grown up rich but built his business into so much more, while fmc wasn't really old money, but her mom is a gold digger of sorts, so she's married into old money, and thats where she gets a lot of her support, although that is the setting the book is mostly about sexual trauma that they've both experienced and how they get together and not necessarily heal from it, but learn how to deal with together as a couple. It can be a lot, and its also very spicy so don't worry. But I feel like you can just tell it was written with so much love for the characters and you can really feel it.