Castiel declares himself a god, and your stomach turns and you know this is all your fault. He was your family, but you never stopped to think you might be his, too. He needed you, and you blew it yet again because that’s what you do. He was happy as an angel for hundreds of thousands of years but it only took you three to break him.
As a warrior of God, you know pain. You’ve been stabbed, beaten, broken, and blasted into oblivion. You’ve been betrayed, lied to, cast from heaven, and abandoned. But all of that is a raindrop on the ocean compared to watching Dean lose faith in you.
Now that you’ve pulled his soul from the depths of Hell, you don’t know what to do with it as your orders weren’t very clear on this point. You decide to remake him as he was of old. As his flesh knits itself together under your palm, you wipe away his scars, the visual reminder of past pain, but you leave his tattoo. He’ll need all the protection he can get.