Eren x Reader x Armin - Get Through the Barriers

When you were younger, you got lost doing something in the Underground District. Since you hadn't returned for days, your brother thought you'd been kidnapped, and since then, nothing has gone his way. Until the one day you came back. Or rather...you were brought back.
Hanji found you in Wall Rose, and she saw distinct features in you that reminded her of a certain Corporal she knew. Yes, you were Levi's never-heard-of sister. And when she brought you back to HQ with her, everyone was surprised. Especially the Corporal.
Ever since your return, Levi has been keeping a watchful eye on you, making sure that no one would ever hurt you. Both mentally and physically. And after the Scouts had realized that you weren't as intimidating as your brother, they started to warm up to you too. Even a certain brunette Titan-Boy had started accumulating strong feelings for you, and you have for him and his blonde friend. But can either relationship work out when Levi's keeping such a protective barrier over you?