AO3

Archive of our own, is a good fanfiction site. Most known for actually letting users upload any story they want (pretty much free to throw whatever shit you can), leading to the best smut you have ever read. The SFW side of it is actually cool too. And depending on who you are, the community is nice.

Person: Hey, did you read this Arle x Needlem0use fanfiction I found on ao3?
Person 2: Oh yeah, loved the part where Sarah just gives Arle's cock paizuri till she cums.
Person 3: Tbh, the author should add a second chapter to it.