Over Her Small(?) Body SPNSNK AU CROSSFIC

Avery Winchester is 15 and has joined the Scouting Legion with all of her friends. The ones who survived at least. Her 2 older brothers are in Levi's squad, making them some of the best fighters in the wall. But what happens when Dean is attacked by a Titan, and Avery accidentally bites her tongue? Can she keep a secret? And why do Levi and Jean keep on acting so overprotective?