Have you ever met two siblings who never disagree? Fighting is part of the relationship between brothers, and with Sirius and Regulus Black, there is no exceptions. This is a 4-part short story that takes place before the original Harry Potter that focuses on the relationship between Sirius, aka Padfoot, and his younger brother Regulus Black. Idea from a tumblr post by marauders4evr. All rights go to JK Rowling, the author of the Harry Potter series.