Trying to find a Draco/Hermione fic but I can't remember the title or author. It's an EWE set after the war. Hermione and Draco (along with Neville, Luna, Susan, Dean, etc) come back to finish their last year at Hogwarts. They have their own tower and have a key to their rooms. Draco is rooming alone and Hermione is rooming with Luna. They also have to become teaching assistants and Draco and Hermione get assigned to Potions and become friends.