Having said that, it is fun to think about how hard obtaining guardianship in this situation would have probably been for most people. Vivio is such an anomaly after all. Nanoha was certainly in the right place at the right time, but it probably pays to have her connections and background as well!
That, and I doubt anybody in the Mid-Childa administration would want to anger the "White Devil" of the TSAB by refusing her to form her ideal family. XD
^ pretty much start around chapter 70 (the kyoto school trip arc) where Kuroko starts making some female "friends" that slowly but steadily turns into a yuri harem. From that point, most chapters are about how the girls around her seems to somehow have the hot for Kuroko in some way or another.
As much as I love the art, I always feels the expressions are somewhat off. It seems to me that the author makes a point to draw them with their mouth wide open just so we can keep seeing their fangs, to insist on them being vampires. ^^; Kinda bugs me everytime I read it.