[Regulus has never been a wordy man, but his absolute silence when faced with the worlds most simple greeting doesn't bode well.]

[Sirius realizes abruptly and acutely that he is not remotely qualified to be emotional support to anyone, let alone his own brother. His mouth opens, and closes.]

I think there's something wrong with all of us, Reg. You're going to have to give me more to go on. What happened?