What about an Au with no titans, no walls just them in a small village. Mikasas parents are still killed and she's taken in by the Jaegers. 17yr old Eren takes a job that will take him away from home. Mikasa is sad and upset he's going to leave her behind, she gives him the silent treatment the day before he leaves. Before he leaves heshocks Mikasa by promises to make enough money to marry her when he comes back.