Thank you! Lucius promises to be interesting to write, especially in combination with Harry.

And very good. I didn't think of him exactly as the opposite of the Harry in Harry's Project, but he really is. In this case, it's Draco who has to realize that Harry is not the person he knew seven years ago. Harry didn't get the best impression of Draco because he was panicky and worried about his father. Draco will get the chance to modify that impression later.

Most of the mystery is solved in the next chapter; Lucius does know who cast the curse, if not why. But Harry still needs to find a cure.