Sirius pulled back just enough to be able to see his brothers face, and if that meant Regulus could see he was crying then so be it.
"I'm really, really bloody proud of you kiddo. I, I should have reached out before you, well, before. I shouldn't have ever let our bitch of a mother come between us. I," he shook his head a little. "Well, it doesn't matter now. You're back, and your secret is safe with me, okay? I won't even tell James. I swear. I just... I'm so bloody proud. You saw what needed to be done and you stood up."