DeviantArt used to be my go-to website in finding these, but ever since the redesign it's become nigh-unusable. I've kept waiting for things to get better, but if anything that website just keeps being enshittified beyond recognition. Archive of Our Own has some fat/wg stuff, but it's all fanfic, and most of it is not very good most of the time. Fantasy Feeder has some great stuff, but a lot of it is really "tame" and you can tell a lot of AI is being used there. It's almost monetized. There's also some other smaller "post your smut here" websites (e.g. Wattpad) but they all suffer from the same problems as AoOO, and with even less content and quality control. Are there any good options left? Or maybe a sort of client/portal that lets you access DA without interacting with their godawful new design?