Apart from constantly informing us that it's a secret that they are lovers (which is very irritating) and the boring trope of the uptight dark girl and the upbeat fair girl and related to that, the equal misogynist way the writer goes out of their way at times to make dark Chidori look physically weaker then an infant compared to fair Nanoha, the way their love for each other is portrayed is very sweet and pure. But it is becoming about time we got some kind of long-term story.
I really didn't want this to end, but such is the way of life. All things must go, good and bad, and I am not lying when I say this is one of the best yuri manga I've read. Definitely one of my favorites.