A Generic High School Teacher AU: Middle Aged Men Pining Edition

A very self indulgent high school teacher AU I started to work on because if Isayama doesn't let them be happy, damnit I will step in and do it myself.
Follow along as Levi slowly but surely, very much to his own surprise, starts falling for the man that mistook him for a student on the very first day he joined.
Featuring: lots of mutual pining and staring, as the others around them try to get the oblivious old fools to just get on with it already!

This is not an attempt to make profit off of Isayama's characters. All characters belong to him. This is simply an idea I wanted to explore.