Whatever resistance Sam might have had crumbles in the face of the way Castiel wraps around him. He reminds himself that Castiel's been through something very difficult, that he's clinging to the one person who seems to know what's going on.

It doesn't stop him for a moment from wishing it were more than that.

He lays his hand against Castiel's back. "I promised that I would be the one in control. For now. I have a better idea of what you need than you do, though for the moment, I'm pretty sure what you need is to be treated and to sleep." Which comes to another problem. "Do you...I don't know if you want to sleep on your own or not."