Levi becomes a parent

A six year old Armin shows up on Levi's front porch at 6 in the morning covered in bruises. Levi can't not help him. This is an au where Levi is a high school teacher and Armin's grandpa died way earlier and he's taken in by an abusive foster family. Mainly parental Levi x Armin but other characters will be there as well. Rated for language and mentions of abuse. No Yaoi.