Mermaid! Eren X Pirate! Levi
Poor, Innocent little mermaid Eren wakes up in some kind of crate, with a crew of pirates. Eren's worries are soon delayed as he meets Captain Levi. Mikasa and Armin always say not to trust humans, because they like using mermaids for bait, money, experiments, and tricks. Eren doesn't believe Mikasa and Armin, saying that Levi's a different kind of man. Is he, really? Read to find out.
I saw this from a comic and got inspired, but I am not taking anything from it don't worry.