Another option is to check out some Harry Potter or Merlin - related fanfiction communities on social media platforms like Tumblr or Reddit. Fans often share and recommend their favorite fics in these communities. You can post a request specifically asking for 'harry is merlin draco is arthur' fanfiction, and chances are, someone will be able to point you in the right direction.
There are several platforms where you can find such fanfiction. Archive of Our Own (AO3) is a great place to start. Just type in relevant tags like 'Harry as Merlin' and 'Draco as Arthur' in the search bar, and it should bring up a list of stories that match this concept.
Friendship and rivalry are also prominent themes. In the original stories, Harry and Draco had a complex relationship. Now, in this new setup, that relationship gets a fresh take. They may have to work together more closely like Merlin and Arthur did, but their old grudges and differences still play a part, creating an interesting blend of friendship - building and ongoing rivalry.
Their relationship might start with distrust. Harry, like Arthur, may be wary of Draco, as Merlin, due to their past differences. But as they face common enemies, they begin to rely on each other. Draco's magic skills, similar to Merlin's, prove useful to Harry, and they gradually form a bond of friendship and mutual respect.
Well, perhaps Draco, in the role of Merlin, has a special connection to the magical creatures that he uses to help Harry. Harry, as Arthur, is trying to unite the different factions of the wizarding world. Draco's knowledge of magic, similar to Merlin's, allows him to create magical artifacts or spells that assist Harry in his quest for unity. And there could be a love story involved too, like Guinevere and Arthur, but in the context of the wizarding world with some other character and Harry.
The novel I recommend to you is " The Wizard Walking in the Heavens ". This novel is a novel about the infinite heavens. The general plot is that Merlin, as the big brother of the myriad worlds, helps the characters of many different worlds solve their problems by walking through different dimensions. There were also scenes where Merlin transmigrated into Harry Potter and Arthur transmigrated into Draco. I hope you like my recommendation.😗
The banter between Merlin and Arthur in fanfiction is really interesting. It can range from light - hearted jabs at each other's habits. Merlin might poke fun at Arthur's love for jousting and how he always gets a bit too competitive. Arthur could retort by mentioning Merlin's clumsy attempts at serving him. Their banter also reflects the underlying respect they have for each other despite their different social standings. It's like a friendly sparring that keeps their relationship dynamic.
Well, I'm not sure about a specific 'Arthur Harry Merlin' yaoi fanfiction that stands out above all others. But you can start by looking on fanfiction platforms like Archive of Our Own. Just type in the relevant tags 'Arthur', 'Harry', 'Merlin' and 'Yaoi' and you'll likely find a whole bunch of stories. Some might focus more on the emotional connection between Arthur and Merlin with Harry as an interesting addition to the dynamic, while others might have different takes on how their relationships develop in a yaoi context.
One common theme is the exploration of forbidden love. Since Arthur, Harry, and Merlin come from different backgrounds or even different fictional universes in some crossovers, their love is often seen as something that goes against the norm. Another theme is the power of magic in relation to their relationships. Magic can either bring them together or create obstacles. For example, Merlin's magic might be a secret that affects how he can be with Arthur or Harry in a yaoi relationship.
The 'Redemption' trope is also seen in some fanfictions. Maybe Arthur has made some mistakes in the past, and Merlin helps him to redeem himself. Or vice versa. It's a way to explore the characters' growth and development. And then there's the 'Battle Against Evil' trope where they fight side by side against dark forces, which really showcases their bond and loyalty.
I really like 'The Sword in the Stone' as a fanfiction - like take on Merlin and Arthur. It shows Merlin as this wise and mysterious figure guiding Arthur on his journey to become king. There are also some great interactions between the two characters that show the deep bond they share. You can find it in many libraries or online bookstores.
You could check out 'Shadows of Arthur and Merlin'. In this fanfiction, the author creates a rather gloomy and intense atmosphere. It shows how Merlin tries to deal with a more menacing Arthur, and their interactions are full of tension and unexpected twists. It's really a fascinating read if you like this kind of pairing.