My Assassin (Killua X Reader) [COMPLETED]

They forced me to sign the papers, they forced me to chain myself to someone I could never love. So I did what I could. I ran away. Life's too short to waste it in a living hell. In a nutshell. I thought that if I could escape, all my problems would disappear with a flicker of my magical wand and 'poof!' That's where...