"And you're an ass." That wasn't Anna complaining, that was Anna stating a fact. She didn't care that she was whining, she didn't care that he was complaining about it. She didn't even care that he was an ass. He was an ass, but he was still here, he was still taking care of her. Even if he had some ulterior motive, he was doing what she wanted him to do. Although she hadn't dropped her guard completely. She knew that her new vulnerable position gave him a little ego boost. Even without her Grace there was this unspoken power-struggle. If she were in the mood to be amused, it might have amused her.
Anna took in a small breath. Every time Cas had taken the bandages off to change them and clean her up, it hurt. Every single time. She moved, it bled, the blood matted the bandages to her skin. It was like a neverending cycle. So she breathed in, trying to remember how to best handle pain. And then she lifted her arms and pressed them against the front of the shower so he could unwrap the bandages.