I loved this. It's great to see a story where the Black brothers are actually friends, and, however weird this may sound, actually brothers. I liked how you portrayed Regulus feeling sorry for his loss of Sirius, but not sorry if Sirius comes to kill him. In fact, I think he hopes it'd be Sirius...I'm saying obviuos things, ain't I? Ah, well, gotta get them out sometimes... Probably the only things that caught my eye were some of the sentences starting with "because".. I mean, the ones where you explain that Mrs.Black was already becoming mad and everything. Maybe I'm being picky, maybe it's my mood, but I just decided to tell you that it kinda irritated me. Other than that little miserable thing that only an idiot like me would notice, this is perfect! In-character and in-depth! Repeat - love it! Waiting for more of your writing...