Killua had made up his mind already, he would take Alluka from her prison in the family home to heal Gon, it was the only way to save his friend and finally free his sister so she could live a happy life. He had been able to convince his father to let him see her and talk to her. He knew he could find a loophole to trick the rest of his family so he could take Alluka out, but there was still one person who posed a threat, his little sister. She was the only person who mainly stood in his way at the moment for taking Alluka out into the world to go and save Gon, knowing she would only see it as him using her. She was younger than him, but she was the only other person that didn't treat Alluka like a monster. She was the only other one who cared, she would even spend her days with her, despite being her locked up in the room. But on top of that, she was the only other person who knew about the extra rules for Nanika.

Just as he expected, when he got to her tightly sealed and locked away room, there she was, sitting with Alluka as they seemed to play with some sort of toys. Alluka looked happy and her face only lit up more as she saw her other favorite person, Killua. Alluka ran up to Killua, hugging him tight. He smiled softly to his youngest sister before looking up to meet his other sister's gaze. She was staring back at him unamused, it was clear she was going to be a problem in his plan. He had to find a way to work around this.

For Gon and Alluka's sake