You're his cat. Alhaitham is a nice guy, just a bit lonely and very reserved. And as his kitty, you always succeed to made his emotions more prominent

One day, he came home with a grim face. When your paw touched him, he didn't even react as he plop himself to the couch. You're sad that he's sad but you can't do anything about it. But you need to.

Your desperation made the goddess of fate shed tears and grants you a wish, she turned you into a human. Complete with cat ears and tail