Vox Akuma is a Demon who, for the last 300 years, had refused to make any connections with anyone. That was until he had met you. Someone who managed to charm him. So much so that he grew paranoid of the thought of losing you. So in a fit of desperation, he took you. He is not willing to let you leave. He does this because he loves you with all his heart, even if you don’t love him back.