It's obvious she'll defeat Sensei. In fact, Sensei probably told her that not as an actual forbidding but as a challenge and a test: if you want to meet the boy, prove your ability and your resolve. One thing I'm hoping is that Tsubaki doesn't fight alone. Don't need the whole group, as several still don't have enough characterization to warrant it (or enough demonstrated skill to be plausibly of any use), but maybe having Sasanqua jump in and somehow trip Sensei up just enough to give Tsubaki the opening she needs would be a great way to go.
Of course, I'd really love it if there's at least an epilogue afterward. I want to see the girls, ALL the girls, actually interact with boys. Maybe have boys that are either great complements or mirror images. There's a lot that could be done, so having even a few chapters of intermingling would be great.