The Arduous Taming of A Difficult Prat (слэш)

All in all, Arthur was one of those men about whom it could be said that their heart was in the right place, although he did take great pains to hide it. Still, the core of decency made Merlin endure the thick layers of arrogance (and their thin crispy crust of arseholery) with more patience than he’d ever thought possible. There was indeed a promise of greatness about Arthur that Merlin was willing to believe in.
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Merlin learns to live and work by Arthur's side. And vice versa.