As the son of New York's most feared crime lord of the late '30s, Katsuki could get anything he wanted, however and whenever he desired. But when he had you, he was at his happiest. Your happiness was his happiness, which is why he wouldn't hesitate to hurt anyone who tried to hurt you. At first, it was strange: every time you complained about someone, that person either disappeared or was seriously injured. Since you didn't know Katsuki was in the mafia, you never connected any of the incidents to him.