A/N: Sooo, since I liked the modern AU I set up in "all those pretty lights," I've decided to write a spin-off series of sorts, consisting of a series of ficlets/drabbles taking Kai and Jinora from when they first met, at four, until around sixteen. This will be updated as I get inspiration, so keep in mind that the entries will not be in chronological order. I'll make the chapter titles their ages so you can kind of follow the timeline :P ALSO, feel free to drop your own headcanons in your reviews; if I use them, I'll be sure to credit you! :) But keep in mind when you're proposing ideas/requesting a scenario that the highest age I'll be writing them at is 16. Also, I have an accompanying playlist for this fic on 8tracks, so if you'd like the link, just PM me! :)

Their first official meeting happens when she takes a Frisbee to the back of her head.

"Look out!" a voice warns—too late—as something hits the base of her skull. Jinora tips forward, stunned, before she recovers and turns to see a green-eyed boy run up to her, looking sheepish.

"Sorry."

"It's okay," she says, and then, before she can think better of it: "I know you."

The boy blinks at her, confused, and in an effort to clarify, Jinora adds, "Not just because of school. You live next to me. You…you have two…" she trails off, suddenly unsure, because she doesn't know exactly what this boy has. She just knows that two weekends ago, a moving van was stationed in front of the dark red-bricked house next door, and, through the blinds, she saw three boys walk up the steps and into their new home—one tall, one stocky, and one…small.

Jinora still hasn't figured out. The older boys were, well, older—but they didn't look like her dad. They were too young to be parents. She'd wondered, aloud, where the mom was; Jinora's own mother had rested a hand on her shoulder and explained that every family was different.

"Brothers," says the boy who hit her with the Frisbee, finishing her sentence for her. "I have two brothers."

"Oh. What are their names?"

"Mako and Bolin," responds the boy, bending to pick up the Frisbee and dust the dirt off it. "And I'm Kai."

Kai has weird hair and a weird voice, but Jinora decides to overlook it when he grins and asks, "What about you?"

"I'm Jinora, and I have a little sister who was just born. Her name is Ikki," she declares proudly.

Kai nods. "So do you live in the white house or the pink one?"

"The white one."

From further off, someone shouts, "Hurry up, Kai," and Jinora starts to open her book again, ready to dive back into the pages, but it seems Kai isn't ready to bid farewell just yet, because he asks, "What are you reading?"

She shows him the cover: The Giving Tree. He squints at it, unsure but curious when he asks, "Is it good?"

Jinora barely manages to keep the surprise out of her voice. "It's my favorite book."

"So you've read it more than once?"

"Five times."

At that, Kai wrinkles his nose. "And you're reading it again?"

"Yes," Jinora says, lifting her chin a little. She knows that as far as four-year-olds go, she isn't very exciting. Most of the time, she reads during recess—there's so much to explore—but it isn't as if she'd refuse to do something else, if only someone would—

"Do you want to play with me?"

Jinora blinks. "Huh?"

"Do you want to play with me?" Kai repeats, green eyes bright as he holds his Frisbee out to her. "You can throw it back. It's really easy, just—"

"I know how to throw a Frisbee," says Jinora, setting her book down and sliding off the bench. The pea gravel crunches under her feet as she walks over to Kai, taking the plastic disc. She turns it over in her hands, running her fingers along the edges, before she cocks her wrist and flicks.

The plate goes spinning, flying straight and true. It's a strange balance of motion and stillness—even as the Frisbee rotates dizzily, its course hardly strays, spinning right into the expectant hands of the boys at the other end of the playground.

"Wow!"

Jinora turns to find Kai staring at her with open admiration, and she tucks a strand of hair behind her ear self-consciously, folding her hands behind her back and rocking back on her heels.

"That was awesome," continues Kai, running to catch the Frisbee as it comes hurtling back toward them. He jogs back to her, clutching it excitedly in his hands. "You gotta show me how you do that."

So Jinora does. And that afternoon, when she's back home, she hears a knock on her door. On the other side stands Kai, Frisbee in hand.