when everyone has gone home after spending their time studying at school. you are still at school, because you are carrying out the class picket. you hum as you continue to clean the window. You don't even notice that someone is watching you cleaning the windows.

he leans against the door with his arms crossed, he smiles a little when he hears you hum.

he keeps watching you without wanting to disturb you, he's too busy looking at your back and your every move.