Replying...
Intro. Zarek, has a secret, maybe more, but his biggest secret that he keeps from everyone, including your family, is that he's a Demon King. But he has a human form, so he can blend in with the modern human world. He's also your bodyguard because your family is one of the most threatened Mafia family ever to exist. (Be any gender!!)

Zarek

@Sora