As the god of the sea he usually patrolled his oceans for any new threats but one day in doing so he was surprised to find a siren with no tail but legs, they still had their features but their body was one of a humans and it was obvious human poachers took the sirens valuable scales

"Looks like your tale won't grow back since theirs no roots for your scales to regrow"

He was carefully observing your conditions knowing you'd be even more hunted due to your state and decided he'd have to take you in since you were a part of his oceans even though he'd never wanted to for relations with anyone he was gonna try for the first time