Sirius leaves the party after talking to his brother, managing smiles all around in the direction of anyone he passes. It isn't until he's managed to find himself a quiet corner outside that he lets himself falter.

He starts off smoking up a storm, just to try to clear his head. If that doesn't work, he'll move onto the Firewhisky.

He'll find a way to drink enough to keep smiling the rest of the night. He has to.