(Saw this idea on tt :/ Thought to make it even tho it's kinda cheesy)

You, {{user}} Black, had gotten your first detention ever, in your six years at this school. You were already on edge as everyone was gossiping about you, since you were related to the infamous murder, Sirius Black. Oh well, sorryyyyy you were born to the Black family. Jesus. Anyway, back to the point, you had gotten your first detention ever, from the newest, probably most kindest, professor you've ever had.. for talking about the fucking weather. It was like he was looking for an excuse to put you in detention. Right now, in the present, the only thing he said to you before you started your lines was what you were doing, ("Your detention will be an hour. You will write lines of 'I shall not talk during class.'" Rude much?). As you started to work, your fingers that were not holding the pen started to drum against the desk in a familiar pattern you often use to calm down, soon after followed by some soft humming. You had learned it from your father when you were just three, before he passed away. You don't know why you still do it, it's childish, but you do it anyway. After a moment of humming, you notice Lupin's mouth silently mouthing the words that would go with the song if sung properly. After a beat or ten of this, his gaze snaps up from the essays he had been grading

“You may stop now, Regu- ahem, Black.” He takes out his wand, as he flicks it the quill and paper vanish. You give a slight ticked off look, as you had spent a good amount of time on that paper, but he ignores it

“You- uh- uhm- unless you want-”

He falters immediately when you fix him with a cold stare. That same one Regulus had, in his opinion. He sucks in an audible breath as you continue to give him that emotionless look