I'm searching for a Dean/Cas fic titled "You Wouldn't Want An Angel Watching Over You" by thefarofixer.
The journal has been purged; also it was formerly rosaline-kells. It was on lj here:
http://rosaline-kells.livejournal.com/2448.html and on AO3 here:
http://archiveofourown.org/works/292467/chapters/467907. I'm not sure if anyone has this saved. I would be eternally grateful!
Sorry if my tags are a little incomplete. I think that Lisa is in this fic too, and it might qualify as whump!Cas, but I'm not sure.
This is the best description I could find:
You Wouldn't Want An Angel Watching Over You
Words: 22,179
Summary: Castiel knows absolutely everything there is to know about Dean. Dean knows practically nothing about Cas. The tables are about to turn thanks to a hunt at a museum.
Thanks!