Here's a quick and easy rule of thumb: If the two main girls in a series end up together, regardless of when it happened, then it is definitionally not yuri bait, it's just yuri.
Also, while it's nice, important, even, to depict physical aspects of a relationship, it's not really all that realistic to always make that the focus. Most people do not kiss, let alone have sex, before they start actively, explicitly dating, so expecting characters who are still courting each other to do these things is just unrealistic.
It is frankly normal in romance, straight or gay, for the main couple to only kiss, let alone fuck, after they get together. It's also normal in romance, straight or gay, for the elements of love, connection, and emotional intimacy to be the focus, not the physical aspects, and that's certainly what's happening with this series.
If what you want is to see two girls fucking, there's plenty of lesbian porn out there for you to enjoy. You don't need to read romance stories for that.