I had to giggle at the use of "it's for the children" against Dumbledore; that's a fitting riposite to his "for the greater good". The prank on the Slytherin girls and the headmaster was amusing and I wonder how long it's going to take Filius to figure it out and how to fix it (since he's not a parsletongue, actually fixing the ward might be difficult for him). The bit with Fenir and friends was amusing, it rather reminded me of the scene in Eric Flint's story (set in David Weber's Honor-verse) "From The Highlands" where two humans near the far ends of the bell curve of unmodified human ability explain, while painfully and fatally demonstrating, to a Scrag that average ability differences don't matter when you get down to individual combat. The discussion between Tonks and Susan was fun as they realize that Harry's a single teenage male and is enjoying himself. Finally, I like the idea of Harry finding Millie very attractive, that could be the basis of an interesting relationship, especially if they could maintain it long term.