Cas didn't so much as answer her as the bartender when he came around. "Whiskey. Leave the bottle."
There had been a time where he hadn't known what that phrase meant. In many ways, he supposed he still shouldn't. Despite his regrettable actions back where he belonged, Castiel had felt he was above such actions. Apparently, he'd been overzealous in his thoughts.
The first shot didn't burn as he knocked it back. In fact, he didn't feel anything at all. The vessel's reactions were dulled by the strength of the new Grace inside him.