"I know," Dean said softly, his hands working slowly over her back. It looked like she was staying, and he knew that was the best start possible. One day of not giving in led to another and another until finally, painfully, it was easy to forget you weren't entirely human anymore. "I know you don't, honey."
He wanted to promise her that if she'd lay down, take a nap, wait two days or do something, it would magically be better, but Dean knew he couldn't make that sort of false promise to her. All he could promise her, all that he had to offer was what he already had--that he'd be there, that they all would. He had to hope that one day that sort of unflinching love would tilt the balance in her favor.