Dance with me

"Dance With Me, Harry" is a cute story by Aerie22, taking place after fourth year. It starts as a typical Harry & Hermione love each other but are not smart enough to confess and understand their feelings and...well, the end is a bit disappointing for the average Grangerista. Not a Hermione Bashing fic, of course, but anyway, a basically, there is an out-of-character canon character. Which one ? read the story to get the clue !