Dreams made of water

Prince Nicholas doesn't remember the last time he has dreamed, but he knows he woke up today after dreaming of the ocean. He feels its calling, the pull. He can't do anything about it, after all, he is the heir to the throne, and the only one in the royal family who doesn't have a gift- or a curse, as the King called it. The urge keeps getting bigger, the pull has an immense force and the dreams don't stop. Nicholas sets on a ship to find the source of this calling... but soon realizes more is at stake than he originally thought.
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Prince Ethan is the youngest of three brothers and he is obsessed with the surface. He has always been and since it's forbidden it's even more appealing... The prince wants to live an adventure, to be free. However, mermaids are strictly prohibited of doing as much as popping a head out of the water, but one day... he goes to shore and finds a man laying unconscious on the sand.