Ever the curious type, nobody knew the hidden mysteries of Hogwarts better than Luna Lovegood. So, when Hermione approached her to inquire if she had learned of any exotic books - perhaps hidden away in some tiny corners - she knew just where to look. Hogwarts had changed little in the years after their graduation, and she quickly found the glowing tome that she was certain would interest Hermione. However... not all books were willing to be read.
As the one who actually opened the book, Hermione had taken the brunt of its rage, but Luna wasn't to be spared either. When the book flew off, they were forced to follow it, helpless and exposed by the predicament it had left them in.
Another version on my twitter and censored version on DeviantArt if someone want that too. And Patreon of course have all 3.