Don't you dare think that there is anything, past or present, that I would put in front of you. It has never been like that, ever! I need you to see that. I'm begging you.
I say we completely erase the part where that “LADY” comes in and fucks everything up, Sam returns to the bunker with Cas, Dean takes Mary and they go back home too, they have a 2 hour long hug fest and there we have it!!! A perfectly happy, family oriented ending. HAVE A NICE SUMMER EVERYONE!!!