I floved this story so damn much. It's hot and thoughtful and passionate and contains two gorgeous characterizations--and there's so much I love about it, I don't even know where to begin!
* Harry's characterization. Now this is my version of Harry: passionate and angry, engaged with life, yet struggling to make his peace with the war and its aftereffects, and so, so passionate. You make him into such a vivid, full-blooded character, it's easy to see why Draco falls so hard.
* imaginative use of magic and the curse scars: Love all the thoughts about feedback loops, energy feeding between a spell caster and his subject--all of which makes for great world-building as well as plotty goodness. I love both Snape and McGonagall's roles in the story too, explaining and subtly supporting the boys.
* Draco is himself here: pissed off, bitter, angry, vicious and witty. He's also wiser, realistic and reasonable--and you reconcile these two sides of him beautifully. I love how he falls for Harry and can barely admit it to himself, much less Snape, or even entertain the possibility of Harry returning his feelings. UST is pretty much my drug of choice. Then they kiss, and Harry turns out to be a tiger in the sack, and then Draco implies afterward (when Harry is thinking it's a one-off) that what they did had nothing to do with the curse scars!! This is a deeply fulfilling version of romance for me.
* Little details that felt right, like Narcissa's characterization, or Draco's complete inability lie, or the sexy bantering, or midnight Quidditch game of Fetch (great name!)--all things that added immeasureably to the fun, humor and joy of reading this story. You nailed the little details, and that's almost as important as nailing the big ones.
In conclusion, awesome story. Had so much fun reading it--was smiling the whole time!