"You have a lot of siblings," Riley observed as he spoke. She honestly couldn't imagine having that many people in the house. Especially since it was already hard enough dealing with Kai on her bad days. That was one of the reasons Riley was grateful she had an older brother who could take care of Kai if it got too much for Riley. And often, it did, but mostly because Riley tended to act like an absolute baby about babysitting her little sister.
"I only have two," Riley informed him, but she wasn't sure why she said 'only'. "Raph and Kai. If Raph was a wizard, he probably would've ended up here with me in Gryffindor. But Kai...I'm not too sure. Shes so weird." Weird was putting it lightly. "I dunno, maybe she'll end up in Slytherin or Hufflepuff. Kai is clever and she has a sort of determination that let's her do whatever she wants and lets her get whatever she wants. But she's also kinda nice..ish. And hardworking. And I don't think she's ever broken a promise before, either."
Riley was describing her 6 year old sister, but the traits from the two houses fit Kai perfectly.
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