[The erstwhile wizard grimaces, a pang of something that isn't nausea hitting him square in the gut.] Bloody-- [he says.] No, mate. It's all right. I'm being a twat because. [Because.] Any rate, it isn't you.

I'm sorry. Do what you like. I'm Sirius, [he adds, because he realizes he probably still doesn't look incredibly friendly. Even before he went to Azkaban and wound up with weird metal Muggletech ports lodged all over his body-- even at his most handsome, he didn't generally look exactly friendly.]