Found! Sam as Boy King, Dean part of the resistance
I'm looking for a one-shot fic (at least it was a one-shot at the time that I read it), wherein Sam accepted the role of Boy King and is either currently ruling what remains of the world, or is in the process of taking it over. I think it was implied that a lot of people have died, but I don't know if the war was ongoing or over at the point of the fic.
I do remember that it's set in Sam's throne room, and Dean comes in, after having been in hiding from Sam for a long time. There were a bunch of hunters trying to resist Sam, and Dean has been with them for a while.
Basically the hunters either sent Dean to kill Sam (with the knife or the Colt, I don't remember) or had decided that Sam needed to die, and Dean snapped and killed them instead, because even after everything, he still chooses Sam over the world. He tells Sam that, that he's killed the other hunters, and he possibly goes to his knees to recognise Sam as king.
I don't remember that it was explicitly Wincest, but it might have been.
I originally found this fic on Livejournal, but since I forgot to save my memories when I deleted my old journal... Does anyone know it?
(Also mods, I couldn't find a boy!king/king of Hell Sam tag; not sure if that's an oversight or if I just couldn't find it.)