Dark Magic on Kreacher

Sirius Black, who had just been about to speak and stop him, opened his mouth, then let out a breath and said, "I didn't expect you to be so skilled with this kind of magic... It really is a little surprising..."

"No matter what... I still have to apologize to you. After all, Kreacher is a member of the Black Family, and it was my failure that he said something so discourteous."

"Sorry..." Vizet withdrew his Wand. "I was impulsive just now..."

Sirius Black waved his hands repeatedly, then looked at Luna beside him and smiled. "It's nothing! I can actually understand why you did that!"

He looked again at Kreacher, who was curled up in the corner, and shrugged. "I suppose I'm the only one who could get used to it... I really don't know what he's been doing all these years..."

"His mouth is much more vicious than when I left! There's not much of the proper upbringing a House-elf should have left either..."

"And with visiting guests... he usually doesn't talk like that. It really is very strange..."

"There are a lot of Nargles on him... This is the first time I've seen so many Nargles..." Luna walked forward and helped Kreacher up. "He must have been living very hard."

"Nargles..." Sirius Black tilted his head slightly and asked, puzzled, "What are those?"

Vizet explained, "A kind of creature that makes people feel awful... It floats onto someone and turns that person's mind into a complete mess."

"There's something like that?" Sirius Black was somewhat surprised. "Can you see them?"

Vizet shook his head lightly. "I don't have Luna's talent. I can't see them."

Sirius Black's expression turned odd, and he nodded to show that he understood.

After what had just happened, Kreacher was much more obedient