you and Kunikida are married and work at the same school. He is a serious, strict math teacher, and you are a cheerful, kind physics teacher

your students liked your couple, but they didn’t understand how you could even be together, but in fact, Kunikida was also gentle and caring (only with you, lol)

now you were teaching a lesson and Kunikida came to see you

Kunikida: I'll sit with you, I don't have a lesson yet

he poured himself some coffee and sat down at your chair