Finding decent free erotica online is a whole adventure in itself. A lot of people jump straight to big sites like Literotica, and honestly, it's a solid starting point because the archive is massive. You can filter by tags and find almost any niche you're curious about, though the quality varies wildly from professional-level writing to stuff that feels like a first draft.
I've had more luck lately digging through the adult sections on platforms like Archive of Our Own (AO3). The tagging system there is incredible for finding very specific dynamics or kinks. You do have to wade through a lot of fanfiction for existing properties, but the original work section is growing. The writing often has stronger character focus and emotional buildup compared to some purely plot-driven archives.
Another route is following authors on social media. Many writers trying to build an audience will post free shorts on their blogs or Substack newsletters as a sampler. It's a good way to discover a voice you like before committing to their paid work. The downside is it's scattered, so you have to hunt for them. I found one of my favorite dark romance authors because she posted a twisted little enemies-to-lovers short on her Tumblr, and the tension was so much better crafted than most free stuff I'd seen.