I just found a gem!
Just Another Day
[NanohaYuuno]After a long day of showing new recruits around, shore leave grants Nanoha and Yuuno the chance to have a date at a festival on Earth.
Dun be fooled by the tag. This has something for everyone, both Yuunoha and Nanote! You have to read it to believe it! And it's exactly what I think the state of affairs between Nanoha and Fate. It's just that MC girls are more open, even the more reserved types.
As a side note, this fic could be where the homo-phillic swarm unites with the Yuuno-300...
PS: Drools about what an unreserved MC girl is like...