All of It, For you [ Dean/Cas Oneshot ]

Dean's a demon, Castiel's stolen grace is slowly diminishing and he knows he doesn't have much time left. //
Inspired by a few posts that I seen on tumblr. Sort of destiel. // Feedback appreciated. Tumblr-inspired.
[[ Tested out a style of writing I'm not used to, probably won't be going back to it. ]]