Vengeance of the Pirate Queen by Tricia Levenseller

As an assassin working for the pirate queen, eighteen-year-old Sorinda is surprised when Alosa’s next task for her is not to kill a new target, but to captain a handpicked crew on a rescue mission. Unfortunately, her sailing master is twenty-year-old Kearan. He may be the best helmsman the pirate queen has, but Sorinda finds him a real pain in the arse. Sadly, there are few places on a ship to hide from an attentive man. As the crew of the Vengeance faces dangerous waters and deadly sea creatures, they accidentally awaken the King of the Undersea, a being who can control… Read more.