"My name is Regulus. You'd think that my own brother would know that." Regulus was pretty certain that the nickname was exactly because Sirius knew that he hated it. "And I have no idea how I got here."
He stood rigid for a moment, before closing his arms around Sirius, even though there was a tiny frown on his face. "Why exactly are we hugging? I doubt a trip to Hogwarts warrants such response after not speaking to each other for over a year." At least when Sirius had been in school, they had threaded insults and snarky comments, but then Sirius had left Hogwarts and that tenuous connection was gone.
"Is this one of your pranks? Because if it is, I really must insist that you end it now. I have urgent business." He almost wished that he could share with Sirius, but his brother could not keep his mouth shut. He'd tell his friends for certain.