[Where: Top of the Astronomy Tower]
Because tonight was a good night to be outside. Sirius was like this. He wasn't a pretty bird to be kept in a cage, he needed to have his feathers ruffled, especially on a clear and cool night like tonight.
He stood on the railing, unafraid of the height, and waited to see if McKinnon would show up. In the back of his mind, he wondered if Wormtail was around somewhere spying on him. Well if he was, he'd simply have to trim his tail. That's all.