KilluGon making a completely innocent "Let's get married when we're (x) years old if we're still single by then".
I’M VERY LATE TO THIS I’M SO SORRY! I’m not the best writer but I’m so tempted to write this one out...SO I WILL. Enjoy!!
Gon’s promises were always simple-minded and easy to keep. It could be as simple as promising to meet up the next day or promising to eat breakfast together, sealing each one with a press of their thumbs and a hearty laugh from Gon (considering Killua would flush every time).
It wasn’t until they were lazing around in Gon’s room that Killua realized he was itching to speak. A lot had been on his mind; most of it being Gon. These were thoughts he’d usually push aside, but the mood inside the room was private and safe. He felt like he could speak. So he did.
“Gon, do you ever think about..”
The island boy was next to him in a second, eyes wide enough to encourage Killua’s continuation. “Do you ever think about marriage?”
Gon blinked, as if the answer was already obvious. “I’d need to train and get better first before I think about stuff like that, Killua.”
“I know that,” he relented. He already had his answer. Then Gon spoke up again. “But when I’m older, I think I could!”
Killua didn’t understand the sudden ball of words lodged in his throat. An awkward “Cool,” was all he could manage. Something bothered him. It was impossible to decipher it when the problem was sitting right next to him.
“Hey, Killua. If we don’t have someone to marry when we’re older, why don’t we just marry each other?”
Killua nearly jumped out of his skin. His expression must have been just as embarrassing as his thoughts because Gon was having a field day about it. His laughter mimicked sunrays and fun days on whale island, filling Killua’s lungs with warmth until he puffed it all out in a laugh too. “You’re so weird.”
“But think about it! We would both know we have someone to marry!”
“But why would you want to marry me? I’m the last person you should be promising this to.”
“But because it’s Killua, I want to promise!”
Killua paused, took a breath, and looked away. Gon didn’t stop. “I can only think about making this promise with Killua.”
And so they sealed the promise with a link of their pinkies and the press of their thumbs once more. Gon’s smile was worth the heat in his cheeks.
Headcanon that when Alluka and Gon go sledding together down a hill, Killua uses Godspeed to keep up with them by foot. He could easily catch up without it but he enjoys the way Gon and Alluka’s eyes widen with delight and how their laughter peaks to new heights when his hair does the Thing
Imagine Gon tucking Killua’s hair behind his ear for the first time. They could just be laughing, playing around like they usually do, and Gon just has this sudden urge to reach over and get those few strands of hair away from Killua’s starry eyes. They both stop breathing when Gon acts on the impulse. Two worlds that revolve around each other come to a halt and Gon smiles. Killua turns red. And that’s how Gon’s habit began.
Gon loves it when Killua gets grass or leaves in his hair. He takes his time picking them out one by one. Killua tells him it’s not necessary, but he lets him do it anyway. Gon goes as far as to pick invisible leaves out of Killua’s hair sometimes and laughs whenever he turns pink.
