Well, I kinda knew they weren't going to fuck, so this is a logical stopping point for this chapter since we're getting a flashback next, and that'll probably take a while. And I highly doubt they'll be able to stall a proper talk from then on.
And you wanna know what? I WISH other yuri manga had this much progress. So far, the only other ones I can think of that go at a reasonable pace are "Handsome Girl and Sheltered Girl" and "After School" (highly recommended, by the way, especially the latter).