I read that fan fiction a year ago on Fanficion.net and I cannot find it again.
This is about Lucius and Voldemort being the mate of Harry Potter. They are demons. I remember that all of the founders are in it too and they are demons too. Also many things happen in the Chamber of Secrets.
Harry became friends with his year mate Slytherins. Also Harry is a little stupid and demands things from Voldemort and Lucius he shouldn't then Lucius go away then came back so Harry won't die.