Here and here for similar asks ;)
One Wedding and One Misgiving by Reyn
"I wanna see an AU where Merlin is the prince of Dragonlords (lol yeah fantasy) and he gets an arranged marriage to Arthur, Prince of Camelot."
Knight (Prat) In Shining Armour by Deminos
Merlin Emrys is the Prince of Albion and one of the strongest Warlocks in his time. Arthur Pendragon is his ever-suffering knight… and lover. Smut with fluff. Oneshot.
The Warmth of Winter by eldee
Dragonlord Prince Emrys of the Druids is assigned the task of negotiating with King Arthur Pendragon of England in hopes that dragons and magic will be permitted to come back home again. (Hopefully that teenaged tryst Merlin and Arthur once had doesn’t make things awkward.)
The Hawk Prince by reona32
An evil Queen has taken over the Kingdom of Avalon and imprisoned Prince Merlin. Prince Arthur of Camelot happens across the manor where he is trapped and vows to free him and defeat the evil Queen before she destroys them all.
Princes, Priestesses, Lords and Ladies by dentedsky
The lady Morgause pointed at Arthur. “Arthur Pendragon, a great destiny awaits you. The battle for your soul – “ and here her finger went from Arthur in the crowd, to Merlin in front of her – “is about to begin.”
The king of dragonlords has come to Camelot to sign the peace treaty. There’s a royal banquet, a royal duel, a royal betrothal and in Prince Merlin’s honest opinion, Prince Arthur is a royal pain. All goes wrong when Prince Arthur accidently proposes to Prince Merlin and, due to an ancient law, the betrothal becomes binding.
Royal Merlin verse by Utsaah [WIP]
Merlin hates everything regal because his mum does.But when Prince Arthur is going to the same uni as him, he changes those thoughts quickly and even develops feelings for him. He begins to wonder why his mum holds such a grudge against royalty. What he doesn’t know is that his mum had a history with the Mercian King and he certainly doesn’t know that he’s the son of that same King