I have to say I’ve been pretty dissapointed in the ao3 fanfic selection for Aoex, though I’ve also been somewhat intrigued by some of the trends I see. I mostly look for Rin centric stuff so I this is pretty limited, but I see lots of aus where Rin is taken to Gehenna as a baby and doesn’t get raised by Shiro. That’s like, the most popular Rin fic scenario I see. Depressed Rin from pre IK arc is also popular. Misc incest comes after that. None of this appeals to me, but it’s kinda interesting?

the-fox-populi-says:

“Miscellaneous incest” is a glorious expression that I will be stealing.

I hardly ever read Rin-centric fics, only some Family Fluff ones, so I have no idea. There’s some original takes here and there that I know of, but they are often short (oneshots) or left abandoned/ open ending.

It’s difficult in general to find fanfic that both caters to what you want and is well-written. Since this fandom is fairly old, you might actually have more luck on fanfiction.org? And of course there’s lots on Tumblr too, but Tumblr’s search function sucks donkey balls, so you might have to go the Google route and just add the website’s adress like this:
www .siteyouwanttobrowse.extension: thingyouwanttosearchfor
(note the : after the website’s url. Space after www not necessary but stupid Tumblr keeps insisting it’s a link even though I repeatedly told it it isn’t)
That way you’ll get search results only from that site alone.