Crowley merely nodded, shifting slightly in his seat so he was more comfortable. He hadn't realised that he was sitting up straight, position tensed up as if expecting Michael to lash out at him, or tensed up ready to flee if necessary. Crowley might not have been able to read Michael but he'd seen enough pissed off angels and archangels to know when the going got tough to get the hell out of dodge. But Michael didn't seem to be interested in taking out any of his frustrations on him, which was good.
In any case, Crowley relaxed when Michael did, and he felt himself smile a little when Michael thanked him. "I might be a demon, but I can occasionally do the right thing," he shrugged, his smile growing a little. He then shrugged. "I know I'm just another demon to you, but you're not just another angel to me. What happened to you, hell, what happened to Raphael, it wasn't right. I was around long enough to see that happen to a lot of people. Demons, angels, humans. All by-products of the Winchesters mantra. Save the world but bugger the consequences."
He smiled thinly. "I'm glad you're here. The world isn't ending, sure, that blood rain thing was terrible, there is an Antichrist here and everything. But with the Winchesters... a little vigilance never went astray. And there's no one stronger and more vigilant than you. I doubt even the cage could change that."