He looked in the mirror all the time now.
He pushed his nose into the glass and inspected his eyes.
No black. No yellow.
Maybe what he was doing with Ruby was alright. Would slip under the angel radar. Not make him evil. Not destroy him.
But maybe it was worth it, if he killed Lilith and ended the apocalypse. Saved the world. Kept Lucifer in hell. Maybe damning his soul was worth it, if it meant his brother wouldn't go back.
Maybe.
He checked the mirror again. No cracks in the façade. Dean wouldn't see anything in his face.