Secret Agents by マミ
Headcanon: Levi, Mikasa, and Armin as trio of secret agents,
with Erwin as their enigmatic superior. Erwin’s Angels? LOL. Partaking in undercover assignments that can take months to complete, they’re bound to grow extremely close. Sparks fly. Hearts broken. Tension rises. Can they keep it all together before it blows up, jeopardizing their current mission and their own lives?