Okay, so having the pretty stranger grab onto his arm made the 'dealing with it later' plan a bit difficult. Sirius managed to look baffled for a moment, staring down at her. He didn't recognise her. As far as Sirius knew he'd never spoken to the girl before in his life. But then, apparenly, she didn't know who he was either.
"Erm..." He paused. Someone had called him that before, a few weeks back. A boy on the network. Godric, how many people were there who looked like him? He'd quite liked being the good looking one for a while there.
"Nooo..." He told her. "Not me. Sorry. I'm Sirius." He quirked a wry eyebrow. "Congratulate this Caspian bloke on his excellent face though."