Castiel knows Jack well enough to know when he’s having an off day. When Jack laughs a little slower, or gives a little more bluster. How his gaze goes distant when he thinks nobody is looking. How his temper is a little shorter. On those days Castiel wishes he could shelter Jack in his wings, take him somewhere, show him something beautiful. But they’re always too busy for that. So he brings him a snack, sends the team out and just does what he can for a man who caries a universe in his heart.