For some reason I can't seem to get any links to work, so here are the directions that will lead you to the fifth and final chapter ;)
(like a real fairy tale this is turning into quite a quest!)
Go to my livejournal (www.livejournal.com/users/ntamara), and the fifth part can be found either under the folder HP fanfic among my memories (folder accessible through the userinfo page), or scroll back to the entries for April 8th.
Be warned that it is rated NC-17 and contains explicit m/m sex.