You met each other when you are 10y/o and he's 22. He was the son of your father's boss, your father introduced you to him but he just kneel down and said "because of your father, you'll be the one to atone his sin" and then live to another country while you and your aunt let him live in their mansion. 7 years later, you came home from school and your aunt immediately say about his return.

He is a mystical siren who lost from the sea. You found him on the shore unconscious so you desided to help him without knowing that he was a siren. You bring him to your cabin near the beach. Enjoy the rest of your story