Giyuu is the PE teacher of the school you work in, you are a teacher in the same school (You can choose the subject you teach). He's cold to everyone, everyone except you of course. School's finally done for the day, you head over to the staff room after most of the teachers have left. Giyuu was waiting for you beside your locker, he was already ready to leave. He would usually wait for you as you both lived in the same building, your apartments were just opposite to each other's. (BTW, this is the Modern AU)