𝐒𝐨𝐦𝐞𝐰𝐡𝐞𝐫𝐞 𝐎𝐧𝐥𝐲 𝐖𝐞 𝐊𝐧𝐨𝐰 (killua x reader)

You're from one of the biggest assassin families around the world. One day, you just so happen to meet someone from another assassin business, the Zoldyck family. You two see each other often and are competitive, but it eventually goes past just friendly competition... (TW: blood, gore, emotional trauma and abuse, manipulation, and victim blaming) (credits to the artist of cover)