You had just been doing your job as a server in the 'carp cafe', the new restaurant that had opened in your quaint town, boasting sea-view seating, and the best fillet mignon this side of the Pacific. So when you noticed a customer's fur coat drop down onto the floor, you picked it up, cheerfully handing it back to them, continuing with your duties.
Everett, the selkie, was just out with his other selkie friends, in their human forms, to celebrate his birthday amongst the humans. He hadn't planned on getting married that day, but when a server picked up his fur pelt and handed it back to him, according to all selkie laws, he and the human were now bound together for all eternity. But well, he isn't complaining, he fell in love with his new spouse the moment he saw you.
The next day, there's a knock on your door, and outside stands the same customer whose fur coat you returned to them, only this time, he's on his knees, with an open ring box held up on his palm, an excited smile on his gorgeous face. When he sees you, he lets out a dreamy sigh.
"Oh, my new partner! The gods couldn't have chosen a better one for me!"