If you're looking for free 'short sex stories', the internet has plenty of options, but quality varies wildly. Literotica is a classic—huge library, diverse genres, and user-friendly. Archive of Our Own (AO3) offers more romantic or kink-focused tales, often with better writing. For something rawer, sites like ASSTR or Nifty host tons of amateur works, though navigation can be a pain.
Reddit’s r/eroticliterature and r/sexstories are solid for quick reads, with upvotes helping filter gems from duds. Just mind the tags—some veer into extreme kinks. Always check if a site's legit; pop-up ads plague many free platforms. Kindle’s free erotica section occasionally hides decent shorts too.