I wish I could remember more, but I read this story years ago. There was some sort of three-part prophecy. One part concerned Dean and an angel. They thought it was Anna but it turned out to be Castiel, I think.
I think maybe demons had taken over the area and the guys were holed up in a house of some sort and took in anyone who needed a safe place to stay. Someone (maybe Ash or Sam) set up a computer system or something. As they ran out of room, either one of the angels made the house bigger, or they took over additional buildings. Someone was in charge of techy stuff, but I don't remember if it was Sam or Ash. I'm not tagging Ash because I'm not certain he was in the story.
I honestly don't remember how it all ended up, but I think it became Dean/Cas. Does this ring any bells with anyone?
Thanks in advance.