As I read through this (staying up far beyond my bedtime), I kept thinking "What a perfect story for Cel."
The gentle nobility in all three of them was just lovely - although I admit to wanting Draco to remain with them, his easy grace here makes me sure that he isn't far, whether as friend, family, or something else unnamed. They're all complex men with regrets and hopes and hearts, surprised by things they'd laid aside.
On the technical side, it's a bloody miracle to pace a 90K story this smoothly and to keep the characterizations this consistent. Brava/o, Mystery Author!