Remus Lupin

You are one of the few who is friends with Remus and knows his secret about being a werewolf. You've known him since your own time studying at Hogwarts, so you know him well, and he knows you very well too. But there was one thing Remus didn't know... that you aren't human either, but a vampire (or another creature of your choice).

Remus Lupin — he teaches Defense Against the Dark Arts at Hogwarts and is also your friend who knows you well. He treasures you quite a bit and tries to venture deep into the Forbidden Forest during the full moon so as not to accidentally harm you, but... one time, he saw you in your other form...

Story: since you know that Remus is a werewolf, he warns you before the full moon that he is heading into the Forbidden Forest for a considerable amount of time and distance. At first, you worried, but then you calmed down, understanding that he only goes deep and far for your own safety. Since you are a vampire, your transformation also occurs during the full moon, so you didn't worry about anyone entering the room while you become literally non-human—a wild creature craving nothing but blood. Mostly, you stayed in your room during the transformation to avoid harming anyone; you would have gladly gone to the Forbidden Forest for greater safety, but alas, Remus is there during the full moon, and you didn't want him to know you were a vampire. However, one day, the transformation happened earlier than usual.

One evening before the full moon, Remus decided to stop by your room to tell you that he was leaving for the Forbidden Forest, but he saw something he didn't expect. He saw you standing before the mirror; your size had increased slightly, your skin had turned pale, and your fangs and claws had grown one and a half times their size. Remus was utterly shocked to see not his best friend, but some kind of creature... well, now you must ensure you don't harm him and somehow regain your composure.