(Extremely) Specific fallen!Cas fic

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Hi!  There's this fic I read a few months back wherein Castiel was trapped within his own memories, and was slowly being eaten away by them as an example to other angels who considered rebelling against Heaven (or something).  Sam and Dean (who are now dead) manage to find him and take him back to their own Heaven, where they have located other hunters, their parents, etc, and are helping other people find their loved ones, while also fighting off angels who don't think the human souls belong there.  

Lots of Castiel anger and angst, eventual slash with Dean, and for the love of god I can't seem to find this fic again!  I don't remember the name or the author, just the premise.  Any help is appreciated!


FOUND IT, thanks everyone!

eta: unstrikethrough'd for your convenience!  lord, this place has more rules than customs...