Regulus Black and the What the Hell ( by gonzoclock)
1 part Complete Four-year-old Luna has been able to see lights her whole life- and when both of her parents die in an explosive magical accident, she decides to grab on to one of the lights and follow it.
Meanwhile, Regulus Black has never really thought of himself as the parental sort- he's hardly interacted with a child in his life, much less raised one. But when two magically inexplicable orphans show up and somehow resurrect him- well, what else was he supposed to do? Not immediately adopt them? Yeah, right.