There's 'A World of Hurt' which is a very emotional fanfiction that explores the different ways Arthur and Merlin can be hurt, both physically and emotionally. 'Merlin's Burden' is also a recommended read. In this, Merlin has to carry the burden of his magic and the pain it causes him, especially when it comes to protecting Arthur. And 'Arthur's Torment' is about Arthur's internal torment when he realizes he has hurt Merlin without meaning to and how he tries to fix things.
One well - received Merlin - Arthur hurt fanfiction is 'The Wounded King' which delves deep into Arthur's physical and emotional wounds after a major battle and how Merlin helps him through it. Another is 'Merlin's Sacrifice' where Merlin endures great pain to save Arthur from a dark spell. 'Arthur's Regret' is also good, it focuses on Arthur's regret after accidentally causing Merlin harm and his journey to make amends.
One great Arthur kissed Merlin fanfiction is 'A Moment of Truth' where the kiss is a culmination of years of unspoken feelings. It beautifully captures their complex relationship.
One possible fanfiction could be that Merlin gets injured during a battle while trying to protect Arthur. Arthur then becomes extremely protective, refusing to let anyone else tend to Merlin's wounds. He stays by Merlin's side, worried sick, and vows to be more careful in the future to prevent Merlin from getting hurt again.
There's also 'Merlin, the Female Sorceress'. This fanfiction shows a strong - willed female Merlin who is not afraid to show her powers and fight for what she believes in, especially when it comes to her bond with Arthur. The author does a great job of developing their relationship in a believable way.
One great 'Merlin Arthur Gwen fanfiction' is 'The Bonds of Camelot'. It beautifully weaves the relationships between the three characters. It shows how Merlin's magic subtly influences the dynamic between Arthur and Gwen. Another one is 'A Triangular Affair' which delves deep into the complex feelings they all share for each other in a really engaging way.
One great fanfiction in this category is 'The Secret Revealed'. It beautifully explores Arthur's reaction to Merlin's magic in a very detailed way. Another is 'Magic and Trust' which delves deep into how their relationship evolves after Arthur discovers Merlin's secret. And 'A New Beginning' is also good, it shows a different take on how Camelot changes with this new knowledge.
You can start by looking on Archive of Our Own (AO3). It has a vast collection of fanfictions, and you can simply search for 'Arthur and Merlin married' in the search bar. There are also some fanfiction communities on Tumblr where fans might share their works or recommend good ones.
One common theme is loyalty tested. In many Merlin - Arthur hurt fanfictions, situations are created where Arthur's position as king or Merlin's role as his servant put their loyalty to each other on the line. Another theme could be sacrifice. For example, Merlin might have to sacrifice his magic or his safety to protect Arthur, or vice versa. Also, the theme of friendship in the face of danger is prevalent. They might be hurt physically or emotionally due to battles or political intrigue, but their friendship endures.
Fanfiction.net is also a great place to look. However, the tagging system might not be as detailed as AO3. But it still has a wide variety of fanfictions. Sometimes you might need to dig a bit deeper by looking through related Arthurian legend fanfics and then finding the ones with the specific 'Dom Merlin Sub Arthur' theme.
You can start by looking on Archive of Our Own (AO3). It has a vast collection of 'Arthur wants Merlin' fanfictions. Just use the search bar and type in relevant keywords.
There's 'Merlin's Hidden Magic in Camelot'. In this fanfic, it delves into how Merlin's magic is a key factor in his relationship with Arthur. It shows how Merlin uses his magic to protect Arthur in ways that Arthur doesn't even realize at first, and how their friendship grows stronger because of it. The story has some really interesting plot twists that keep you hooked.