Their Little Human

There are five powerful beings on the Earth.
Angels are the head to keep everyone else in order.
Demons are the typical ruler breakers. Most like to piss off the angels.
Then we have your vampires, werewolves/shapeshifters, and warlocks.
Each being has their own rulers within them. There's also a council with each member of the beings on it.

There's other beings on Earth, also. We have fairies and trolls and other lesser beings.

Then there's humans. Humans have found a way to survive in a world full of monsters. Some humans are traded off, occasionally. But usually they're left alone to roam. They don't do much harm.

There's also special cases that one of the higher beings are mated to a human. It's rare for that to happen, though.

It's even rarer to have mates in three out of five of the most powerful beings.

But that's just Ethan's luck. He would, of course, be mated to a warlock, a vampire, and a werewolf.

He's only a cute little human.