DrakeGrimmhound
If I recall correctly, he set up the wards for his home to not allow anyone inside, even other Blacks. Yet a bunch of house elves he has never met before are able to pop in casually. I mean, this isn't surprising really since they did it in the movies too, but it should be a bit of a warning to him to find a way to elf-proof his house.
Your story is kinda going everywhere right now. You might wanna reshape it a little. Your not really following the rules of the world your character is in and your making him grow at an exponential level, one that doesn't even make sense. I like the idea you have, but you might wanna go back to the drawing board for this one. Please continue though.