My awesome friend, AkaiitE has been working on an Attack on Titan fan-fic in an alternate universe where Levi and Eren are police detectives in New York. Here is my fan-art of her fan-fic. Hiding out in Levi's dark home.

Here is the link to her story: http://archiveofourown.org/works/1014646

You need to read her work, it's amazing!! (NSFW!) Also may contain SNK spoilers, especially if you haven't read the manga past where the show ended. It's definitely worth checking her story out, I'm deeply impressed!

Eren Jaeger and Levi Ackerman (c) Whomever owns Shingeki no Kyojin (Attack on Titan)
Art (c) ME
Story (c) AkaiitE/Nobody_RXIII13