Honestly, I've been using Literotica for over a decade. It’s not the sleekest site, but the sheer volume is unmatched, and the tagging system lets you drill down into very specific kinks. The quality is a total crapshoot—some writers are genuinely talented at building tension and realistic dynamics, while others just… aren’t. I find the best stuff in the 'Non-Erotic Story' forums sometimes, where people aren’t trying as hard to be 'hot' and just tell a compelling anecdote.
For more curated, literary-leaning stuff, I scroll through the erotic sections on Medium. You need a subscription to read a lot, but the prose is usually stronger and more character-driven. The comment sections there are surprisingly thoughtful, less about rating the 'spice' and more about discussing the writing craft, which changes how authors approach their work.