This is also an AU, it could be the Miraculous inspired one, but nothing in the following hints at that.
Day 5: Southern Water Tribe
Katara's laughter is swept away by the wind, carried wide across the snowy fields and hills.
The snow under her feet is old, already hardened, so running is relatively easy. Even though she grew up running through fresh, soft snow, laying fifty centimetres over the ground, she hasn't done it for ages.
Since she was eight years old, she has lived in Ba Sing Se, and barely visited the Southern Water Province. So she wasn't used to the cold and all this fur anymore. But nonetheless, she loved it right from the beginning of coming back.
Her boyfriend seems to have a different opinion. He doesn't laugh, and Katara can hear him closing in.
A smile tugs on her lips, but she's not ready to be caught yet, so she slips to the side, using the hardened snow to glide two metres away.
Zuko stumbles, but can catch his balance in time. His eyes are narrowed at her, and his jaw clenched, but she can see that his anger is only part of the game.
So with a wide grin she runs further into the icy tundra.
After she slipped out of Zuko's reach for a few more times, and got him growling in frustration, she finally has enough, and decides she will let him catch her next time.
Just in that moment, a hand grabs her wrist, she is pushed to the ground, shrieks, and then feels snow being pushed into her parka.
Zuko is on top of her, getting his revenge.
"Garr!" Trying to slip out under him, Katara is shaking, and has to admit that no matter how much she likes the cold and the snow, having it in her parka, dropping down her back isn't comfortable at all.
"Now you regret making fun of me," Zuko growls.
"I didn't make fun of you," Katara protests, still wiggling.
"Ah, so teasing me about getting cold so easily and shoving snow down my neck is not making fun?"
She presses her lips together and maybe feels a little bit bad. "No, that was teasing and having fun. I would never..."
In that moment snow is shoved into her face.
"Aaaaaarrrgghhh! Ew! Urgh! Idiot!" Katara shakes her head to make the snow go away, but it only falls into her hood, and she has some in her mouth and nose, too.
Zuko shudders with laughter, and she sticks her tongue out at him.
He uses the moment to kiss her, though, and she articulates a soft sound of surprise. His lips are passionate on hers, and she wishes there wouldn't have to be all these layers of clothes between them.
As if reading her thoughts, Zuko leans back and murmurs "You should really get out of this. With the snow in, you could catch a cold."
Katara raises one eyebrow. "Same for you. And we should probably get back to the village, before getting out of our parkas."
Zuko blinks, staring into her eyes, as red colour blooms on his cheeks. "Y-yeah," he stammers. "I meant that." Then he pushes himself up to stand again.
Chuckling, Katara reaches for the hand he holds out to her, and lets herself be pulled up.