You can add Love My Life to that as well, given the story starts when she's about to introduce her lover to her dad, and they only grow into each other from there. You can also add the Touhou doujin MariAli, since they get together about a third of the way in or so. Similarly, Santa Sangre, an excellent Nanoha doujin, starts with the two of them already in a relationship.
I totally share your frustration with stories that END with the girls getting together, especially in light of how much good storytelling can come after that point. I think in part it's due to the very short nature of yuri, most publishers don't seem to want to devote much space to developing stories. Stuff like Sweet Blue Flowers or Sasameki Koto, that take more than two volumes, are pretty rare, and one-shots are the norm. So there's not much space for the kind of character development we both want to see.
I don't mind romances that cover the early part of a romance, up to where it's a sure thing. But that's hardly ALL I want out of yuri.