Unfandom #1: Original Works

This may seem a little counter-intuitive - isn't "original works" just published fiction? But there is a thriving section of the Archive Of Our Own dedicated to original works; the genre slews heavily toward sci-fi and fantasy, with an extra helping of erotica. Basically, this part of AO3 is a sandbox for authors to have fun in, and maybe test a story concept before trying to publish. I'm considering writing a few short stories for it myself.
The ones I have recommended are usually - but not always - community favorites as well (I'm tracking the AO3 tool "bookmarks", as generally people will only bookmark a fic they think is worthy of a reread, and so it is a better aggregate statistic than kudos or comments). I also took advantage of the expansive erotica subsection, so be warned that not all of these are SFW.

( Every possible trope is on AO3 if you look hard enough )

Fandom #1: Discworld

Discworld was not my first fandom, and honestly I'm so happy with canon that I only go fishing in fandom once in a blue moon. But when Discworld fics are good, they are excellent.

( Here there be - well, slash, mostly )