Once and Future

Arthur and the knights are back from the dead. Merlin finds himself at Hogwarts, and the W.W finds out that Edward Potter, BWL, had a twin named Harry. Now Morgana is back, and so is Voldemort; and Merlin once again has to save the day whilst helping Arthur build a kingdom. Contains: Merthur, mpreg, MA content, light bashing, slash, OCs, Sev/Lily, don't like, don't read