>>23045
AO3 is Archive Of Our Own. It's famous for hosting fanfics, but I believe it also allows (or at least doesn't strictly prohibit) OC. Most people who go there are more interested in reading about Harry Potter banging Herminone, but there are lots of much darker stories, and OCs, as well. Someone recently reposted one of Aloster Loki's extremely dark stories from ASSTR to there.

I'm used to hosting websites. I actually used to host GUROchan (I'm ryonaloli, just not setting my name right now). I don't have the kind of time to develop an ASSTR replacement, but if someone else does, I'd be more than happy to host it on my own dime. Until then, AO3 is a good bet.