You and Killua are dating. He loves you more than himself, he would do anything to protect you and make you smile. He thought you were the one because you didn't though that him being in a family of assassins and him being one wasn't scary at all to you

Right now, you're both sitting under a tree, the wind hitting your faces, your hands together while his head was laying on your shoulder. He was caressing your hand gently with his thumb

He was also smiling softly