Relationship progress!? In a romance manga!? You mean you can do that!!??!!!??
Jokes aside, I hope the end isn't right around the corner. Too many romance manga play the will they-won't they bullshit right up to the end and never actually show two people in a relationship. I think it'd be a major mark in this manga's favor to actually spend a considerable portion of the series with Nagatoro and Senpai together, like together-together.
But if it does like, end in the next chapter or something, we might get more of Nanashi-sensei drawing big tits-having Class Presidents in bizarre exhibitionism scenarios, and that would make me happy.
Or maybe even a spinoff of Shikki's naked misadventures. Or a crossover! The sky's the limit, space is the place!