Being Human: Mermaid! Reader X Various! Yandere! AOT/ SNK

Being swept away from your home in the deep, blue sea by a horrible tsunami, forced upstream of a river in a forest invested in giant man-eating titans, and trapped inside a lake near a giant wall containing all of humanity is all old news to the littlest mermaid known as you. But meeting various males (and some females) who've become completely hell bent on keeping as theirs was a completely new concept to you. And why did these people want to keep you from going back home?