Merman mate

 1000 years ago your ancestor was the maid of the mermaid king Lucas by your ancestor was afraid of him so she escaped with the help off of your family. He has a vow of vengeance against your family and to take his. It’s the 21st-century. He has come for you but first he killed her entire family in front of your face. You are beyond scared of him. He forced himself on you so you can breathe underwater now it’s your wedding and Lucas feels guilty knowing that you’re broken and scared