I'm looking for a story I read years ago, probably around the 2011-2013 range. I remember it being really long, but I'm not certain if it was 100k words (which I thought was A LOT back then) or 500k words. It started off after the events of Season 5 probably (although I could be wrong). It started off with Dean being in a really bad place (because Sam was sent to the cage with Lucifer?) and drinking a lot. At some point Castiel and later Michael show up and help comfort Dean. Dean and Michael talk, and Dean eventually is willing to say yes. When Michael possesses Dean, it's like Dean is in the backseat and can still see/hear everything with the same senses that Michael has (including being able to see wings the faces of an angel).

When not possessing Dean, I think Michael was possessing some dead/comatized aunt?

Over time, Dean ends up forming a group with Michael, Castiel, and probably Raphael, and they're essentially who Dean is closest too.

They meet up with Sam and their cousins at some point, although they're all wary because Dean is with Michael (and even said yes to Michael).

There might have been a scene where Dean and Castiel go to the Vatican and end up borrowing some powerful ring that Dean learns how to use.

I think Dean/Michael eventually end up going to a museum to get some artifact (although it's surrounded by angel wards), and later on some Aztec pyramids with a ton of demons for whatever reason (although I might be confusing that with something else).

There's a possibility there was some form of wing grooming and wing kinks going on, but I'm not certain.

That's about everything I can remember. Any help would be very appreciated.