It will become clear in time. We're just two chapters away from the latest raws.
The only thing clear right know is how it can't end nicely. Also what the hell was that invitation to appartement ? Why it isn't something you can talk at school ?Assuming it's just a discussion, i don't see the point to invite her to the appart. Unless the brakes are broken and Sensei decide to fuck her, which will be very strange and too much fast-paced. I'm confused on how i should feel about that.