Well I'm losing my mind trying to find this fic- Where Sam!Lucifer some how gets a hold of Cas near the era of " The End" and they end up watching the Earth burn. There was a point where Cas kinda told Lucifer was gonna kill Dean ( I think it was in front of him because he said something along the lines of "make it quick"). It sounded like Castiel was tired of everything and was confused almost; he often used "Sam" to talk about Lucy. I also remember it was kinda short around 1000 words at most. Please help end the madness! Thanks for any help that can be given!