So just Zelos then? It's not exactly professional, but I can live with that!

[ She wasn't going to call him ma'am! Possibly sir, but not ma'am. Even if he does have luscious hair. ]

Hmm, is "the mysterious and beautiful nurse" not good enough? My name is Takamachi Nanoha, you can call me Nanoha!

[ Would giving away her real name come bite her in the ass later? Maybe, but it might just as well be hilarious, so... ]