Curate, connect, and discover
There shouldn't be THIS many rules for fanfiction. "Only read & write on AO3, must be in character and canon compliant if it's not an Au, Perfect grammar, etc" It takes that fun out of it, man.
Idc what you write. It could be the most jaw dropping, pearl clutching, disgusting, dehumanizing, most out of character, criminal stuff. As long as you put a disclaimer that "Hey! This has some unhealthy dynamics, should NEVER happen irl!" It's okay! (I mean, I won't read it personally, but that's fine!)
Upload it wherever. Put it on Wattpad, or AO3, and ff.net, doesn't matter! Read wherever you want. Yeah, I want an algorithm because it's a hobby, so I read on Wattpad a lot, but sometimes I'll also read on ff.net.
It can be out of character, too. It could be the worst interpretation out there, and I wouldn't care. I wouldn't read it, but it's fine. Make one of them a hunk and the other helpless. It's not my cup of tea, but it's fine if it's yours!
Add those weird triggers you want, put in the rare pair, make it out of character, upload it everywhere, IDC. As long as there's a disclaimer for harmful content, it doesn't affect anything!
In summary: Stop adding rules to fanfic and then telling people to write what they want. Do whatever you want as long as there's a disclaimer for harmful content. It's literally a hobby, keep being fun with it.