[ Deep inside his vessel, anchored by blood and grace, his true form stirs in resonance for the soul he could not save. Castiel watches Sam breathe deeply, eyes closed, and stays silent giving him this moment. In his eyes, he failed him. He was their guardian and yet he let Sam sacrifice himself on his brother's altar. ]

Sam... [ His wings shift, unsettled. ] It matters.

[ Knowing it was his choice didn't stop the remorse from rising up like bile. Weak and graceless, Castiel was next to useless back then. Now at least, he could do something. Be of use. Spurred on by that feeling, Castiel steps into his space, facing him. He couldn't pretend he didn't see the pain that cut straight to the bone of his soul, flayed open by a well-trained hand. ]

Sam. What you went through... It's no small miracle you're standing here.

Whatever you need. I'll be here.