The Sunken City Series by Emma V. R. Noyes

Amare Bellamy is not a witch. Orphaned as a child and raised on a ship by the most dangerous men in the Caribbean, Amare is one thing and one thing alone: a pirate. And pirates hate magic. After a fateful storm plunges her to the depths of the ocean, Amare wakes to find herself in a strange new world: an underwater kingdom, where magic exists, but is strictly outlawed by the King—a man who claims to be her true father... moreAmare Bellamy is not a witch. Orphaned as a child and raised on a ship by the most dangerous men in the Caribbean, Amare is one thing and one thing alone: a pirate. And pirates hate magic. After a fateful storm plunges her to the depths of the ocean, Amare wakes to find herself in a strange new world: an underwater kingdom, where magic exists, but is strictly outlawed by the King—a man who claims to be her true father. As Amare struggles to fit into her new role as Princess of the Sunken City, she finds herself tangled in a web of love between two brothers—one good, one not so good. And as strange powers manifest within her, she must question everything she was raised to believe—especially if she has any hope of stopping the evil brewing at the bottom of the ocean. less

Amare Bellamy never meant to get married. She had a simple plan: rescue the Captain, rendezvous with the crew, and escape the Sunken City. But when her father bumps up the wedding without notice, she has no choice but to comply... that is, until Lukas shows up. Lukas presents Amare with an ultimatum: break into Skullhaven and collect the ring that could raise the Fallen Witch, or watch her friends die... moreAmare Bellamy never meant to get married. She had a simple plan: rescue the Captain, rendezvous with the crew, and escape the Sunken City. But when her father bumps up the wedding without notice, she has no choice but to comply... that is, until Lukas shows up. Lukas presents Amare with an ultimatum: break into Skullhaven and collect the ring that could raise the Fallen Witch, or watch her friends die. She agrees, under the contingency that, once their mission is complete, they never speak again. Amare is dead set on sticking to this plan... until she finds out they must pose as a married couple to get inside Skullhaven. Cornered, she agrees to keep up the ruse until they can get the ring and get out. But what happens when their fake marriage starts to feel not so fake at all? less