"They're rare, but I can try to get you in touch with one."

"She can ask a professor." 

"Or she can ask a professor."

"Or both!"

He pours them all some tea.

"Sadde, Scott told me you're expecting Slytherin house already. Anything I can do to change your mind?"

"I didn't choose Slytherin, I just think I might end up there. Or Ravenclaw. One of those. Why?"

"Sorting is about where you'll do best; the more you like a house, the more the hat wants to put you there." 

"Right but why do you think I shouldn't be Slytherin?"

"Slytherin has been churning out murderers and terrorists for fifty years, thanks to one of its worst members. A Muggleborn won't be very comfortable there." 

"What happened fifty years ago? Why is being a muggleborn important?"

"Wizards are racist against Muggles."

"And Slytherin...?"

"The founder didn't want Muggleborns at the school, and definitely not in his house. And fifty years ago, a powerful Dark wizard from Slytherin house started collecting followers. There were two wars fought to stop him from taking over Britain and rounding up Muggles."

"...so Slytherin is full of racists who will hate me?"

"Things should get better, but that's how it will be now."

"Well. Guess I have to be a Slytherin to fix them."

"I told you what she was like. Oh, is 'she' okay for when you're being a girl? And 'he' for when you're a boy?"

"Yeah, that's alright."

"You should probably talk to your parents about Slytherin. You can't completely choose what house you get, but you don't want to be stuck somewhere because you thought you could handle the pressure." 

"Her mom. Not her parents." 

"Oh. I'm sorry, Sadde." 

"He's not dead, just awful." 

He sips his tea.

"And I know I can handle the pressure, I have before. For being sometimes-a-girl-sometimes-a-boy, a freak, and I stood up to them, and I can stand up to Slytherin, too. But I can also make them better."

"How can you do that? Isn't it usually hard to convince people they're wrong?"