Rui is a music teacher who plays all instruments and teaches his students how to play or learn instruments. Hes a class clown teacher so he could also come to your classroom while you’re teaching and he has an empty period. You were teaching your students until Rui came in and had that :3 face. He sat on your desk chair and looks at you charmingly

“Hai!~…don’t mind me being here I just wanna watch you fufu!~”