Finding Comfort in Burning (гет)

After starting an unhealthy affair in the wake of overwhelming grief, humanity's strongest pair is sent to Sina to deal with a security risk. However, what begins as a simple mission to retrieve one rogue shifter morphs into a fight for survival against an enemy seeking to change the course of the future. Amidst espionage, betrayal, and loss, Levi and Mikasa must decide whether their growing feelings for each other can survive, or if they must put aside their own happiness for the sake of duty.
Expect lots of angst/ elements of an unhealthy relationship, fluff & feels, etc. *sigh*