A tail for an eye - Eren x Levi

Eren x Levi (Attack on titan)
Pirate and mermaid AU

Some pirates roam free over the seas, looking for lost treasure and rare aquatic species to sell for money. Others, such as Levi Ackerman, are paid to do the dangerous work of hunting said rare species. All aquatic animals fear the dreaded boat named "The Colossal Titan", especially the mermaids and mermen who's duty is to protect their oceans.
But things may change for one merman when he encounters the ship and decides to take matters into his own hands...

perhaps not all pirates are bloodthirsty killers after all...