This story is getting pretty heated and I'm glad to be here to read it.
I think you're writing is incredible. It fits the character very well and I admire her somehow. Zara is a fragile thing, but she's strong in so many ways I still cannot fathom.
Sullivan is being a part of this story a lot better now. I'm wondering what will become of the both of them. Surely, he'll be more than just a math tutor to Zara. I guess you've given me something to look forward to.
As for him, will Kenneth be included in the following chapters? I don't want him to ruin anything. If he will be a part of the story, I suggest you add in more details about him; if he's married, does he have kids, what's his job now and stuff.
Other than that, I truly love your writing and I hope to see a lot more of it soon!