What if two strangers showed up at Hogwarts in Harry fifth year. And what about the strange end to the Triwizards Tournament, could they have something to do with it? Are they even brothers and why do they sound like they've been in lots of life and death situations? Arthur/Merlin slash, the rest of the pairings are canon. Don't like, don't read.
Crossover - Harry Potter & Merlin - Rated: T - English - Adventure - Chapters: 21 - Words: 118,601 - Reviews: 459 - Favs: 943 - Follows: 1,158 - Updated: 12/31/2018 - Published: 11/21/2012 - [Merlin, Arthur] Harry P. - Complete