This is quite lovely. I'm a little fascinated by explorations of Regulus's change of heart, which, while doomed was in many ways a much more principled stand than Snape's, and yet we know so very little about it. I also quite love stories about how the Death Eaters view their own culture, and perceive each others as human beings, the way they understood how they lived. This did both those things, as well as tell a rather bittersweet love story.