Based off a Modern AU where Levi is a honorably discharged war veteran with PTSD.
Directly after the final bloodshed of war, Levi had been admitted into a hospital where Erwin Smith was his nurse. All of Levi's friends had died during the war, leaving him lonely, paranoid, and emotionally closed off.
Through many trials and errors, over much whispering and shouting alike, and over time, trust grew between the patient and his nurse. By the time Levi was to be discharged, they had become close.
However, with all his friends gone and no trackable family to turn to, Levi had nowhere to go. Erwin offered a place in his own home for Levi until Levi could adapt back to a modern day lifestyle and get back on his feet.
Somewhere along the journey of getting a place to live and moving on with his life after the war, Levi falls in love with his new life and his new family.