A minor quibble (not that I'm trying to tell you what the term means in your story, just the Potterverse): apparently, halfblood refers to any witch or wizard with muggle or muggle-born parents or grandparents, meaning that Draco's kids would be halfbloods, but their children would be purebloods. That said, I had to look that up; I had been under the mistaken impression that once you let filthy muggle blood into your family, your line of descent would forever be tainted.
(On second thought, this is a terrible idea, but) [X] Amber
C'mon, she's been trying to help us with our night terrors for a while now, and we could really use the help, but Shinji would never ask. This is a perfect opportunity to either get that help or beef up our Occlumency, and I think we should take it.