Fics like What Infinite Heart's Ease

Canon era AU. Betrayed by the people he loves best, Arthur finds comfort in the arms of his manservant, Merlin. In the wake of Uther's death, the unrest to the east intensifies and shocking secrets are revealed. As a young king struggling to find his place and control a kingdom on the verge of war, Arthur must decide whether to continue his father's crusade against magic users or place his faith in the one person he thought he'd never trust again.

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4. Next to You (It's the Rule) by LunaMyLove (Merlin (TV))
5. Destinies Collide by Maki, Yumeori (Harry Potter - J. K. Rowling, Merlin (TV))
6. Good Fortune by platonic_boner (Merlin (TV))
7. Gadarene by unpossible (Merlin (TV))
8. How to Untrain Your Dragon by Teumessian (Merlin (TV))
9. The Son-in-Law by Tossukka (Merlin (TV))
10. The Other Prince by Merlinfirstlastalways (Merlin (TV), Arthurian Mythology)
11. Favorite by astolat (Merlin (TV))
12. Cheers and Spirits by CaffeinatedFlumadiddle (Merlin (TV))
13. Catching Bees with Honey by CaffeinatedFlumadiddle (Merlin (TV))
14. Where I'm Meant To Be by WhiteRoseCottage (Merlin (TV))
15. Emrys the Really, Truly Terrible by lindenwaverly (Merlin (TV))
16. Allow One to 'See' by mollrach13 (Merlin (TV))
17. About Time by rosewatergold (Merlin (TV))
18. Falcon's Roost by Merlinfirstlastalways (Merlin (TV), Arthurian Mythology, more)
19. You've Got Your Reasons by CandiceWright, FervidAsAFlame (Merlin (TV))
20. A More Worthy King by remuscariad (Merlin (TV))