A written trove of enormous proportions is 8Muses - specifically their Erotic Fiction forum.
https://comics.8muses.com/forum/category/erotic-fiction.26/Within the Erotic Fiction forum, if you're looking for a place to peruse CFNM stories - a specific author - try the written works of P.F.Dee. This author has been posting things to the internet for years . . . you may remember him as Pancakes For Dinner. He has his own blog,
http://pfdee.blogspot.com/?zx=1f001d98b287d0aabut also sells longer works on Amazon, etc. Many of his works are currently posted on 8Muses at
https://comics.8muses.com/forum/discussion/17619/p-f-dee/The search engine on 8Muses is a bit klutzy (but improving). You can search for 'CFNM'. Among the other authors whose works you're likely to find posted are Oopsy, Pringle, and Joex - inhabitants of Bookiesilk.