Great episode. Also loved Sam getting called out. Dean sorta considers Crowley a friend still, you can tell.
And I don't think Dean refused healing because he unleashed the Darkness. I think it was penance for almost killing Cas when he had the mark. The looks and the 'I had it coming.' and all.
Though Cas is now three for one in Cas VS Dean so I don't think he really had it coming lol.
Oh and I was DEAD during the scene with "Aziraphale and Not!Crowley" because DAMN GUYS WE ALREADY KNOW YOU READ GOOD OMENS THANKS. But amazing scene none the less
That angel is now Aziraphale until proven otherwise, damn it.
Edit again:
Apparently super popular fan theory:
Random porn pop up while Cas is trying to do research?