Cas smiled ruefully at the thought, but nodded. "That...is a certain truth," he admitted. "Though if it is an occupation, then I don't feel as though they're compensated nearly enough. We can try, but...in the end, there is no level of gratitude that I've found to be acceptable."
If only because acceptance was key. He wasn't some "baby in a trenchcoat" to her. Nor was he strange. Or something to be spoken to as though he were a joke. These things he'd never begrudged from anyone else, but it was still pleasant to be known as simply "Castiel" in her eyes. Even if he no longer used that name, she was the only one who could say it and not make him feel as though he were undeserving.
"I don't know if Nanshe enjoys coffee, but...perhaps you should bring her some one morning. It's apparently an act of affection and solidarity. And seems to be effective."