The story progression feels more and more like something that would make more sense for a weekly serialization, rather than a bi-weekly one. I mean this in the way that things are being dragged out / set up with a relatively large gap between chapters with any form of resolution not seeming to be getting any closer.
At this point, it's likely because the author is currently doing multiple titles at the same time. I've been groaning about the release schedule because of how to story progresses since around chapter 2, this suggests the other manga has been in the works since then. If it gets too much, things will either slow down even more, or one title would have to end sooner than expected.
As for Hiba, it looks like she always teased Naoto and that hasn't changed at all. It also doesn't seem like she's done anything so terrible to him that it would make him outright hate her.
Yup, this pretty much screams, she
OWNS him, and will do whatever she likes to do with him.
It really does seem like the teeth thing is in some way significant, but it could just be a red herring. Although, her talking about his canines almost feels like an innuendo for him being a virgin. It could be a virgin sexually, or it could be in another way.
I mentioned this before
in an earlier chapter, but the detail of him drawing blood with a significantly light bite (compared to Kawashina's on him) when he bit Ishikari Hiba's thumb really makes one wonder.
Some of the things going on are starting to make me wonder if these girls are only like this with/around him because he triggers something in them that makes them act like that.
That's some harem protagonist level ability, right there. The girls and their quirky fixations on him suggests there's more to him than just the "regular average Japanese youth". Then again, it's also probably
because he's the "regular average Japanese youth" that the girls are fixated on him. It's like Aono Tsukune and his not-harem of supernatural girls all over again, except the supernatural is not confirmed here.
Fully expect the next chapter for something to happen to stop Hiba from doing anything to him, or stop anything from going all the way and give Naoto the worlds worst case of blue balls.
I, for one, expect Luna to suddenly show up half-asleep or in a daze, join them then interact with either one of them (or both) in a suggestive way, putting her "slut nature" in question even more. Simply because the author hasn't given us one of those in about two months. Then again,
never reaching the truth, is still an option.