Home From The War.
Five months after Eren had gone to fight in the war, Mikasa finds two soldiers on her doorstep. "Are you Mikasa Yeager?" One asks.
She nods. "We were asked to give you this. I'm sorry, Mrs. Yeager." The other says, turning and walking off, the first in tow.
She opens the letter. "Mikasa. I'm sorry. I'm writing to you in the hopes I won't coming back. Goodbye. I hope you live a full and long life without me, in case I never see you again." She reads to herself.
"No… No… No!" She cries, falling to her knees, sobbing.
She sits there, not moving. Soon she picks herself up and goes inside, mourning her husband's death.
After she'd fallen asleep, a tall, lean, muscular, strong, well-built figure opens the front door, entering the house. He closes the door, silently making his way to the room he shares with Mikasa.
He strips, quickly changing into his night wear, brushing his teeth and climbing into bed, locking his arms round Mikasa.
The next morning.
Mikasa wakes to find herself in strong arms. She looks over. She screams. Eren jolts awake. "Morning, Mikasa." He sleepily greets. She slaps him.
He stares at her. "What was that for?" He asks. She starts shaking in fury. "I got a letter from the soldiers returning. It said you weren't coming back, that you were dead!" She screams.
"Oh." He scratches his head, awkwardly. "Mikasa. Look at me. I'm here, right? Awake and alive, right? Calm down. There's nothing to fear anymore." He says, taking her into his arms.
She stops shaking, slumping into his chest. "Don't ever do that again! You scared the living hell out of me!" She snarls. He laughs. "I won't. I promise." He says.
She sighs, relieved her husband was home and well.