Siren Sails by Aria Storm

Yuliya Black is betrayed by the crew she was navigating for. After a bloody scrape with the black-sails, she and her apprentice find themselves stranded on a port in a nasty foreign city. Between the card games, she’s won and the women she’s bedded, Yuliya becomes persona non grata with local authorities.
Willa leads Yuliya to a potential new job. A captain is seeking a new navigator for his ship. Yuliya must roll the bones of fate and take this chance to bid farewell to her troubles. Soon she will realize that between the broody half-fairy Captain, and the deadly lady assassin, her troubles are only multiplying.