Natural Strength || Levi Ackerman x Reader

It's rarely known where the famous duo of Humanity's Strongest Soldiers came from since they didn't arrive together. (Y/N) (L/N) and Levi Ackerman are two sides of the same coin, but others aren't aware of why. Battling and never leaving each other's sides, (Y/N) and Levi are a conundrum for everyone to figure out. On...