There's a first time for everything, and a last time

– Hermione, call me Hermione. – you whisper then suddenly. The twin does not turn to you completely, but it rotates the head of some degrees: he opens the mouth for the surprise, but he doesn't react and he quickly goes back to his reading. He then puts out of his cloak a feather and a piece of paper and starts writing a task for the morning later, with calm and precision.