Seriously, this is kinda sad to impress a girl with FF knowledge? If girls get off on this, then I'd had a girl long ago. say something sweet, something kind and something affectionate to her. I dunno, write a poem for her, that'll impress her!
But if you won't desist...
"I'll be your knight" ~Squall to Rinoa
"Just stay close to me" ~Squall to Rinoa
"I'll protect you" ~Squall to Rinoa (sigh)