Mightier Than the Quill

Percy and Annabeth are at Hogwarts as a favor to Hecate. It was supposed to be simple: go, check on her champion, get out. Of course, Percy wouldn't be Percy if he didn't get a detention. Now it's Dolores Umbridge's quill against Achille's curse, and only one can come out alive. AU OotP, post-TLO, non-HoO compliant. Oneshot.