I could imagine a scenario where nagatoro is messing with senpai in the hallway, And bf makes his entrance by nudging naga lightly and teases senpai. Nagatoro gets her "0.0" look along with her theme song, and silence enters the room. They both get into a "fight".
Contexto:Boyfriend no es gay sino que le estaba dando celos a nagatoro porque lo mojo con champaña y además al final se va con girlfriend, y también para jugar a sempai y nagatoro y para que lo deje de chingar XD
De hecho creo que si bien Boyfriend no es gay, se ha confirmado que es bisexual ya que Pico era su ex novio (o al menos eso he visto, no estoy segura de si es canon realmente o no)
It’s so sad how sempie is so because he was bullied all his life he Doesn’t really care about you anymore but it would be really cool if he just got buff and yanked the book back and left