Submissive princess seeking a pirate captain.
Vague idea is princess is in route to a neighboring kingdom where she is to be wed. Pirates attack killing all on board, except for the princess. They take her to the kingdom for ransom and she is wed to the prince there who is mean to her.
The captain however can't get her out of his mind and after some time, we'd play both sides of the story the prince and the princess and the captain and his crew, the captain returns to check up on her. Seeing she is clearly abused and not happy, he plots a kdinap and makes her the queen of his ship.
Their adventures at sea can follow.