KILLUGON HEADCANON
Ok but imagine this:
One morning Killua decides to leave Alluka to Leorio so he can go to Whale island for a week to be with Gon, after they separated. Also he wanted to suprise Gon with that...
He is already on the island and now he is going to knock on the door, knowing that Mito-san will be the one who opens the door, beacuse it's too early and Killua knows that Gon sleeps at that time. But suddenly, he hears someone jumping from the window from the 2nd floor, screaming "KILLUAA!!", and as he looks up to where the sound is coming, he sees Gon with the biggest smile jumping into him and hugging him on the ground. Killua, who is fullfil of joy, asks Gon how did he know that he is there. (SPOILER: because Gon doesn't have Nen anymore, he can't sense someone's aura: END OF SPOILER)
Gon replies: "I was sleeping but then i was woken up by your scent ".
Killua, smiling: "So you still remember it?..." and hugs him tight.
Then they get up. Mito-san gives them breakfast. After their stomachs are full, they go to their favourite places from the island, having fun together. As the night falls, they lay down and while watching the stars they talk to eachother about their adventures when they weren't together....
IM CRYING BYE (also srry if I've made some spelling mistakes...it happens ✋😔)