Sirius was more than annoyed at the fact that his brother had managed to weasel out of speaking. He felt like he'd been tricked into breaking a few good years of silence that laid between them. Smarmy little bastard.
He held his hand up in front of Regulus to stop him. "You'll walk in front of me. I don't advise you do anything. As we pass people, feel free to look at the faces of the people you and your friends have been fighting against. Do not talk to anybody but McGonagall. She'll hear what you have to say with what I'm sure will be a fair ear. If you're lucky, Mad-Eye will be in too. After that I guess they'll decide if you're welcome to stay or go. After that you can do whatever the fuck you want."