AN: Cas PoV one-shot after he learns Dean is a demon. Destiel if you want it to be.
An Angel's Demon
The wracking pain from having almost no grace was as nothing to the pain I felt when I heard Sam's voice say the most awful words in the known universe.
Dean is a demon.
My Dean is the very antithesis to what I am. Why do I feel even worse now?
My grace...I don't even care any more. Hannah asks me something, I ignore her. Dean is the only one worthy of my attention. It was because of me, wasn't it?
Because I hadn't been around to warn him about the Mark of Cain.
Metatron. Not me. Or maybe if I had simply gone along with Metatron, this wouldn't have happened. Dean wouldn't have died and become a monster.
Because of me, Dean died. Because of me, Dean fought Metatron. It's all my fault, isn't , God?
Of course, God isn't listening. No one is. Heaven is empty.
Hannah was staring at me with a blank look on her face, the same look I'd given the Dean a long, long time ago. I waved her away.
Hannah's brow furrowed in concern. She once again said something to me. I didn't hear it. I just waved her away.
The only thing I could hear was Dean is a demon.
The only thing I care about now is Dean. Not my grace, not Heaven, not God, not Sam, not my family.
Dean is the one who needs my help now.
I will do anything in my power to save Dean.
Even if it means taking another angel's grace. Dean is all that matters now.
Dean was always the only one that mattered.