You can try fanfiction.net. It has a large collection of fanfictions from various fandoms, including Merlin and Mithian ones. Just use the search bar and type in relevant keywords.
There are several notable ones. For instance, 'A New Beginning for Merlin and Mithian' which starts with a new chapter in their lives. Maybe Mithian has come to Camelot for a long - term stay and she and Merlin start to really understand each other on a deeper level. 'The Promise of Merlin and Mithian' is another. In this, Merlin makes a promise to Mithian during a difficult time, and the story unfolds as he tries to keep that promise. And 'Merlin and Mithian's Unexpected Alliance' shows how they form an alliance that no one expected, and how it changes the dynamics in Camelot.
Magic and power dynamics also feature frequently. Merlin's powerful magic and Mithian's position in her own kingdom create an interesting dynamic. Fanfictions may explore how they use their respective powers and influence to help each other, or how they navigate the complex world of magic and politics in Camelot and Mithian's homeland.
One popular story could be 'The Adventure of Merlin and Mithian'. It might focus on their journey together through magical lands, facing various challenges. Another could be 'Merlin and Mithian: A Forbidden Love' which explores the complications of their relationship in the context of Camelot's rules and politics.
One common theme is adventure. Since Merlin has his own adventures in the show, fanfictions often continue this trend with him and Princess Mithian. They might go on quests together, face magical creatures, etc.
There's a really interesting one called 'Mithian's Choice'. In this fanfic, Mithian has to make some tough decisions that greatly impact her relationship with Merlin. It delves deep into her character and how she really feels about Merlin, and there are some beautifully written emotional scenes. The story also weaves in elements of Camelot's politics and the role of magic in the kingdom, making it a rich and engaging read.
First, you need to understand the characters well. Read up on their personalities in the original series. Merlin is kind - hearted but also has a big secret, and Mithian is a strong - willed princess. Then, come up with a unique plot. It could be a time - travel plot where they end up in a different era.
The exploration of different scenarios that weren't shown in the original series. For example, how Mithian would react to Merlin's magic in a more private, romantic context. The 'lemon' part often allows for a deeper dive into their emotions and physical relationship, which can be really engaging for readers who like to see the characters in new and exciting situations.
Another option is FanFiction.net. There are many authors who write about different aspects of Merlin and Princess Mithian's relationship in their fanfictions. However, the quality can vary, so it might take some time to sift through and find the really good ones. You can start by looking at the ones with high ratings and a lot of reviews.
You can try searching on fanfic platforms like Archive of Our Own. There are often a wide variety of Merlin - related fanfics, including those involving Mithian. Just use the search bar and type in relevant keywords to narrow down your search.