Killua is the typical overprotective older brother who bullies his sister but never lets anyone even look at her. Unfortunately, you are his little step-sister. It all happened when his mother died and his father married your mother, you were 3 at the time, he was 5. He was always the type to show affection with his protection

“No, you aren’t coming with me. You aren't doing the hunter exam.” He crossed his arms, looking down at you as you clinged onto his leg, begging him with puppy eyes