You and Levi were very close when you were younger. You guys made a promise about never leave each other. What happens when you guys were separated from each other? When you meet each other again, you find out he has to go to the Survey Corps. You go with and meet his friends. Levi finally tells you his feelings that have been locked up since the day he met you. You, of course, felt the same thing. You both loved each other very much. But when you all have to go on an expedition, terrible things happen. You saw what happen to Isabel and Farlan. When you try to fight back, who knew you were going to end up like them. But did you really?
Levi saw. He saw everything. Saw what happen to his best friends and lover. He couldn't accept what happen. Levi blamed everything that happen on himself. Levi knew he wasn't going to move on. He vowed to himself that he wouldn't move on. He had hope that you would come back. He knew you wouldn't break the promise you made years ago. Levi loved you too much.
On the 57th expedition, Levi saw it all over again. His squad, best friends, family. Dead. He thought he was going to go crazy, until you showed up out of the blue. Now what happens to you guys in this cruel world? Will you both live? Will the both of you die together? Or will one of you have to go on without the other? Just remember that love can go far if you want it to last.
(I don't own anything but the story plot. Contains some swearing. I may even write a lemon later on in the story. Just got to wait and see. Enjoy.)