D/G, (and others pairings) x-over LotR *tiny spoiler* ^_^;; The students leave the safety of Hogwarts to somehow stop Voldemort's return to power. However, they must pass through the forest, where the demons live.....

the two rivals, forced by dumbledore to spend the entire summer together, have gotten into more than enough trouble and there's more to come. *complete* but warning: you won't like it. sorry ahead of time.