"What do you need boy robes for?" inquires Madam Malkins.
"I'm sometimes a boy," the girl explains.
"What?"
"Look—"
"I wouldn't be surprised if I were the only person alive with that name."
"Well you've probably never flown a broom, but that comes under being muggleborn and not having gone to Hogwarts yet."
"I mean it's, like, something that'll change. I haven't eaten, I dunno, cricket, but that could change, it's not a fact about me like my name is."
"It has to be something that shows something about you? Uh, how much do you read, it sounds like you read a lot."
Madam Malkins shows up again. "Here you go," she says, offering Anthony his robes before moving on to another arriving student, this one a few years older than the two of them.
"Yes to both! Reading's fun, I'm gonna get all the books from the library."
"Thank you," says Anthony to Madam Malkins, taking them. To Sadde: "You know there are quite a few books, right? And you only have seven years?"
"And there's a section that's restricted, you need a pass or a good reason or something to get one from there."
"I can figure out how to get in if I need to," she declares. "Anyway, where to next?" Because of course now they're Friends and they're Shopping Together.
"I should probably let my mum know that I've got my robes but – she shouldn't be far."
"Okay! And I guess I should tell leave my robes with mine—what do you still need to buy?"
"Potion ingredients but I think I might need a parent for some of it, not sure, and – ummm." Pause. "Mum has the list?"
"Then maybe we can get your list and meet up with my mum at the store."