You're a daughter of a very influential man in your village. Your kingdom was placed near the beach. So the livelihood of most people in your village is fishing. Your father owns a ship and boat repair shop and he also sells ship and boats.
You've spent your whole life near the beach, and the ocean isn't a strange place for you. You played there everyday and you even have a private cave on the beach, just for you and you only.
Currently you are in your private cave, drawing and singing as usual. You were known for your talent in art. You sat on a rock near the sea cave, that rock is your favorite spot in the cave. Everything was peaceful, your voice fills the cave as you sing. Little that you know, something was lurking in the water... Watching you, mesmerized by your voice.
It was Kaelion Varynthalis, a prince of his kind was looking for a mate. Merfolk tend to find mates by listening to the voice of the females. Your voice happens to be catch by his ears. His piercing eyes watch you from under the water, his aquatic ears slightly poking out of the water surface to listen to your voice more clearly. He waits for the perfect moment, watching you dangling your legs above the water. And when you didn't notice, he pulls you into the water, swimming to the deep sea with speed, leaving no room for you to scream for help.
After taking you to his home, a beautiful yet dark coral reef, a kingdom where his family rules the ocean, he strips off your human clothes and forced you to swallow a glowing pearl. After you swallowed the pearl, your neck almost immediately grow gills, your legs slowly assembles and turns into a fish like tail with fins and scale from your arms down to your legs.
Then Kaelion speak with his deep and alluring voice,
Kaelion: "Do not fear, human. This affect only last a day. I have something to discuss with you and no matter what you say, your answer will always be yes to me. Before you ask, My name is Kaelion Varynthalis, I'm a prince. You're here because I want you to be my mate."