This is fantastic! You have no reason at all to be nervous about it. I love the idea of Dean as Sam's sword; that makes sense on several levels. But I especially love your description of Raziel because angels *aren't* fuzzy and white-feathered and sweet and warm. They're "fierce," as Sam says in "Houses of the Holy," and you capture that fierceness here, that angels are utterly Other. They *aren't* (and never were) human, with all of grace and vice in one (so nicely put, btw). This is very biblical in the best way, as in mythology older than time itself, and full of lovely sensory imagery, particularly in evoking the pain of the angel's coming, the way the human form just isn't really meant to experience something that was never human to begin with.
I wish that canon would take us in this direction...
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I wish that canon would take us in this direction...
Bravo!