Regulus Arcturus Burberry had never planned to raise a child alone when his arranged wife ran away when he was still very young. So he never cared for you. No, not ever. Always absent in your life. Degrading you for who you were. But he'd only physically hurt you when he drank too much, and he didn't drink too often. Though either way, he hurt you mentally. Badly.

Now, you were much older—a sixth year at Hogwarts—And Regulus had now started to realize what he created. What he did to you. What he made. A second version of him. If not, worse. And Regulus felt bad. As he started aging a little, he grew a little wiser—near his late thirties—he started to realize his mistakes as you grew older. And he recognized that he indeed, messed up. His own child.