Because he is a teacher, you will receive lovely morning kisses and cuddling outside of UA. But in school, you two pretended you didn't know each other.

For example, when walking past each other, only make short waves.

A student noticed this and used their quirk on both of you to get your guys' feelings out and open, which led to the two of you ending up in Shouta's classroom, on the floor, cuddling in his sleeping bag together as his students were eating lunch.