Castiel nods, but is silent as he follows Sam out of the shower, slightly unsteady because of everything that has transpired, because he's tired and hurting and knows that his shame will only grow as they proceed.

"I'm sensitive."

It sounds like a random statement as he lets Sam envelop him in a towel. But it can mean a lot of things. An apology should his body react inappropriately to touch. An apology should he cry out because he hurts easily, too. An apology he cry.

Always an apology, because he feels that apologizing is all that can soften the inevitable fallout of all this for him.