A while ago Killua heard Leorio talk about how, if a person stuck their lips in the same container where you stuck them to drink water or some other liquid, then you would be sharing an indirect kiss.

At first Killua ignored him about it, and he felt disgusted at some point since he was never interested in such nonsense.

However, that changed one day.

During one of your trips, you, Killua and Gon stopped to sit under the shade of a tree since the heat was too much to continue moving forward without taking a short break.

Each of the three took out their bottle of water to quench their immense thirst, but you came across the unfortunate surprise that you didn't have a drop left.

Killua saw him out of the corner of his eye as he touched his own water, so when he finished drinking he offered the bottle to you.

He nodded when you smiled and thanked him, acting natural and uninterested.

But the moment your lips made contact with the main hole of the bottle, his mind quickly involuntarily recalled Leorio's words and his normally pale cheeks turned a deep red.

So much so that he had to pretend to pay attention to something else to turn around in a quick, almost abrupt movement.

He was acting like a fool right now and he knew it, this made no sense That you drank water from his own bottle didn't mean anything out of this world.

it was nothing special, and yet he couldn't calm down the rampant beating of his heart.

Damn Leorio and his double meaning comments!