That was absolutely fucking incredible. My brain is spinning, trying to figure out who wrote this (although, I admit, I have my suspicions... *wink*) so that I may shamelessly fangirl. The plot was lovely, the dialogue was exquisite, the concepts were skillfully executed, the poetry was stellar, and the pure prose was perfect.
In short, I loved the whole thing. It was everything I'd like to see in a realistically explained way to bring back Severus, as well as a quality post-war characterization of Draco. I loved it all.
*applauds* *offers tinsel-clad!Draco and gift-wrapped!Harry as fangirlish gifts of homage*