[There is a long period of silence as Zero mulls over her words. It still doesn't make much sense, at least in terms of what she's claiming of him.
They were allies? Of what exactly? Knowing Yuuki, any sort of alliance she could claim between them she'd milk for all its worth. It wouldn't have to be anything substantial for her to cling to it.]
To be honest, I tend to agree with Yagari and my associates. If he wants to take out the rest of the purebloods, that just means less of a problem for me later. I can't think of a single reason why I'd stop him from taking care of Sara Shirabuki--let alone draw him into the Association to come after her unless it was only to draw them both from the Academy.
[Honestly, that's the only thing he can think of that they would be allied over. Protecting the school.]
Bringing her into the Association for protection--I dislike her nearly as much as I can't stand him.
What exactly are we allied on, because if he's entered the Hunters Association it's just an invitation for me to take him out. Something I doubt you'd desire an alliance on.