Lions and Fins - A Klance Mermaid AU fanfiction

Keith, Pidge, Hunk, and Shiro found the red lion on earth, and have found every other lion except Blue. When Allura finds a planet completely covered in water, saying that the Blue lion is somewhere on the planet, everyone knows it's going to be dificult to get to it. But what happens when the Galra have gotten there first, and have enslaved an entire race to try and get the blue lion? And what about the boy with the blue fins? Why isn't he affected? A Klance fanfic with a twist! Oh, yeah, I don't own Voltron OR the Cover art. Those belong to their respective peeps.