If you're hunting down legal places to read fanfiction for 'Mindsight', I usually start with the big archives because they're safe, well-moderated, and respectful of creators. Archive of Our Own (AO3) is my favorite — it's nonprofit, searchable by tags, and authors post with clear content notes so you can find exactly the kind of story you want. FanFiction.net still hosts tons of older works, and Wattpad has a lively scene (though its moderation can be hit-or-miss). I also check Tumblr or Dreamwidth for standalone fic posts; many writers link to their full collections there.
Beyond those, I look for the author’s own website or blog. Lots of writers maintain personal archives or repost their work to platforms like Patreon, Ko-fi, or even a simple WordPress site. If a fanfic has been licensed, rewritten, or published commercially, you might find it on Kindle or other ebook stores — always a good sign of official permission. And if something seems to be missing, it could have been removed under a DMCA request, which is frustrating but part of copyright enforcement. Personally, I prefer supporting authors when I can, whether by donating or spreading the word about their work, because that keeps the community healthy and legal. Reading responsibly makes the fandom feel kinder to the people who write the things I love.