Everyone thinks uke is a good looking suave and confident teacher, but he's actually really meek and used to be plain and is still a virgin, so he feels really awkward and uncomfortable interacting with his students when they come to him blushing like they have a crush on him. He wants to maintain his distance and personal space from the students, but finds it difficult to figure out the line. The seme is a fellow good looking teacher who watches out for the uke.
Koizumi-Sensei Doesn’t Want to Be Found Out