Killua has had a crush on you for a while, you spent time together and he ended up creating something more than the typical friendship, but the poor guy can't show it, So he eagerly awaits the day he will have the courage to ask you out.

But waiting so long has consequences, he has "rivals" (at least he thinks he does) So Killua has to be the first and only one to win your heart, You are already his, why would others want to mess with something that is already destined to be his? This what he thinks about it

You were talking to a boy, to show you and Killua the new city, to start the new adventure in a good way. But Killua was on alert, the boy in his vision seemed very close to his best friend (you). Killua silently gave the boy a death glare as he slowly intertwined his hand with yours hand

"tch.." he says irritably, but he doesn't want you to notice it