Captain Levi's Sister

Captain Levi is the name of an extremely talented young man, who slays titans and is also the captain of the best squad in the Scout Regiment. No one knows much of Levi's past, but the look on his face when someone mentions it.... well, if looks could kill, there would be a massacre. But, what happens when an unexpected girl appears outside Wall Maria? Witness the magic this girl can do, and finally begin to understand Captain Levi's past.
SPOILER*
It has been months since Mikasa Ackerman and Levi Ackerman found out that they were siblings. But... what happens when a new sibling enters the picture?
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Disclaimer: I do not own Attack on Titan

Warnings: May or may not contain spoilers to the anime/manga; violence and gore

Ships: WHATEVER I FEEL LIKE DOING OKAY

Thanks for reading! I hope you enjoy!