Last panel from the first page made me laught. And that wink..... Nanoha is such a ladykiller.
I don't remember and I'm kinda lazy to go throught the whole series, but have they kissed already?
Nope. No kissing yet.
Refer to Chapter 9: Future Relationship:
Page 7: Nanoha: 'Somehow... In this position, it's almost like we're gonna... Ki-' [Finishes tying her scarf with lots of blushing from both on page 8, then pushes away embarrassed at the top of page 9] "OKAY! IT'S DONE!!" Then at the bottom of page 9 to the top of page 10... 'Mm... Eventually,,, the day when we do stuff like that... will come.'