"There is no way that would ever work! How could you even suggest that?!"
Katara thinks that Zuko is probably glaring at her. In reality, she can't see a damn thing.
"You just told me that the last time you and the Avatar were in here, that you kissed and lights came on—"
"I know what I said!" Katara shouts, feeling blood rush to her cheeks. "But I didn't mean that I wanted you to kiss me."
"Then why mention it?!"
"Because—because it's pitch black and I can't see anything and I can't believe I'm trapped in here with you. It'd never work anyway since you actually have to like the person you're kissing!"
She hears Zuko let out a huff of frustration. "But you were the one who—Forget it! Girls are crazy!"
"No we're not!"
"Yes, you are!"
"No. We're. Not."
"Yes. You. Are."
"NO WE'RE NOT!"
"YES YOU ARE!"
Katara jumps a little. Zuko's voice is much closer then it was a moment ago.
"Just shut up!" she snaps furiously.
"Me?! You're the one who's being—"
"SHUT. UP. YOU. STUPID—"
Hot fingers trail up her arm, grasp her shoulder and then yank her forward. Katara's mouth slams against Zuko's in a kiss that's not really all that pleasant.
But the fact that it quickly does become pleasant is astonishing. Zuko's lips are chapped, he kind of smells like sweat, and, like Katara, he doesn't really know what he's doing.
But he's still a boy.
A boy who isn't ugly. A boy who is taller then her. A boy who, despite being trapped with her in this stupid cave for hours, has not touched her until now.
Neither pull away even after they begin to notice green lights beyond their closed eyelids.
Eventually both do step back. And then there is awkward coughing and hands being shoved in pockets. Neither of them want to point out the obvious.
Neither of them are supposed to like each other, after all.
"We don't speak of this to anyone, got it?" Katara can barely look him in the face.
Zuko looks perplexed. "Agreed. Never."
Years later, it becomes one of their favorite stories to tell as a married couple.