"Wait, you mean they're allowed to do magic at home without repercussions?" Hermione asked in a tone full of disbelief.
"Well not technically" muttered Sirius. "It's still against the law for them to perform magic outside of school, it's just that there's no way for the ministry to enforce it so some pure-blood parents allow their kids to get away with it."
Sirius looked like he was struggling with whether to continue or not. Having reached a decision he admitted, "Some even encourage it. If Harry had been raised with me I probably would have had him using magic from as early as possible." He then cringed waiting for the explosion he knew she was about to unleash on him. Everyone knew Hermione was a crusader, and didn't take any hint of inequality quietly.
So it was understandable when a look of pure befuddlement crossed his face at the sound of Hermione laughing at him.
"Umm, Hermione?"
This only led to Hermione laughing even harder.
Which led to Sirius pouting.
"Sorry, but your face, you just look like someone took all your squeaky toys."
Slowly she regained her composure and finally took pity on him. "You think I'd be mad that you'd let Harry practice and help him better protect himself? Nope, not even that mad at the other children being allowed to practice when I'm not."
Sirius' confused look didn't lessen a bit, "Why not?"
"Well honestly, I know they did it out of some stupid blood prejudice motive, but it's not a bad law in general. It would be too easy for some muggleborn or muggle raised to accidentally break the statute. Not to mention if something goes wrong there's no one there to fix the issue."
"Oh, then why did you sound so outraged when you found out?"
His laughter at her answer could be heard throughout 12 Grimmauld.
"Filthy mudblood." The whole hallway hushed at Draco's comment. No one was surprised that he said it after Granger showed him up in class again, they were just surprised that he said it in front of Granger and Potter. And even more surprised at the sounds of giggling coming from Granger.
"What are you laughing at Mudblood?"
"You call me names, and think I'm lower than you because you're a pure-blood. That somehow makes you a superior magic user. Let me ask you Draco, do you perform magic at home during the holidays? Did your parents teach you magic before coming to Hogwarts?"
"Of course I do, and of course they did. Unlike your filthy muggle parents, mine are capable of teaching me magic."
"And the rest of you?" she asked his entourage.
Crabbe and Goyle just nodded, but Pansy couldn't help herself from spewing her opinion, "The Parkinsons are pure-bloods, so obviously. Some families are just better so are allowed to do this."
"And none of you see my point? With all your so-called breeding and all the extra practice and training you all have, the only class any of you are even in the top ten in is potions, and that's because Snape is so obscenely biased that it would be more surprising if you weren't in the top half. And even then you're no higher than third."
Seeing their rage build sent her over the edge again and the giggles made a comeback. "So you see, you prove your whole pure-blood supremacy theory wrong without me having to voice any opinion."
As she turned and led Harry away, Draco noticed all the muggleborns laughing at him and the sight of even some of his fellow Slytherin pure-bloods smirking was his breaking point as he ran away.
"So that's what had Sirius laughing so hard this summer? Does he not realize he's one of those pure-bloods too? I love my godfather, but he can be such an idiot."