Immortal she returns to me

For seven thousand years, humans had lived under the watchful eyes of the eternals. Humans, young and old alike had grown to fear the ferocious beasts. One that was created by a god, the very god who created the saviours to fix his mistake.

Deviants and Eternals are different from one. Deviants, predators that were designed to help expand the world for the emergence but the project had obviously failed.

Then the eternals, sympathetic beings that can feel emotions. A dark and heavy contrast against the monsters.

But oh what would happen when a young deviant who was capable of such human emotions came to be? When an odd friendship of a deviant in a form of a human who was cast away with such shame and an eternal cast forever in the body of a child, misunderstood yet had such an endearing personality was formed, challenges will eventually snake it's way into a friendship that defies all the odds.

Can this sisters be able to make their way through life for the upcoming seven thousand years while trying to hide their bond from public eyes? or will the others found out about it?