Absolutely fantastic. I loved everything: the beginning was perfect, exactly how I'd imagine the meeting between Narcissa, Draco and Harry in such circumstances. Very in character, and very emotional at the same time.
I loved how you slowly built your story, given us time to adjust to Harry and Ginny's failing relationship, and the wandlore theory was nicely crafted. Kreacher and Snape made wonderful side characters. And for the BDSM, well, very original setting, brilliantly done.