This was a great read! Had to read it straight through--no stopping! Loved the original, innovative magic. Sometimes an author makes that over-complicated, but it didn't bog down once; I never felt lost in the genius of it. And what a great idea--that obeisance of the Death Eaters, post-Mark, was coerced.
Your characterization was fascinating too: Pansy and Greg sort of joined at the hip (and Snape was right; how'd Goyle ever end up in Slytherin anyway?), Severus and Lucius together had a naturalness to it, the feel of mature respect and fondness; Hermione was a pleasant surprise--still the gal with the brains, but wonderfully human and pragmatic about her own attractions and fears. Most of all, I loved the plot point concerning Harry, and how they all worked towards a solution that would keep him safe, yet free themselves as well.
Really liked that last scene--the playfulness of it, the innuendo, and knowing that everything was finally right with their world. Great fic!