One popular theme is the re - imagining of their relationship. For example, exploring how a female Castiel would interact with Dean on a more emotional level. Maybe she would be more in touch with her feelings and it could lead to a different kind of dynamic between them.
Another theme is adventure - based. With Castiel's angelic powers and Dean's hunting skills, they could go on all kinds of exciting adventures together. It could be about them saving the world in a different way than in the show, and how their relationship evolves during these adventures.
Another theme is the redemption arc for Castiel. In these fanfictions, Dean plays a crucial role in helping Castiel find his way back from any dark paths he may have tread. For example, some stories show Dean standing by Castiel during his struggles with his angelic nature.
One common theme is the exploration of a different kind of relationship dynamic. Since Castiel is female in these fictions, it often changes the power balance and the nature of their connection. Another theme is the adaptability of both characters. Dean has to adjust to a female Castiel, and she has to navigate her new form in relation to him.
There are fanfictions with the theme of alternate universes. In these stories, Dean and Castiel experience different versions of their relationship. For example, in one universe they might be rulers of a supernatural kingdom, and in another they could be ordinary humans. These themes add a lot of variety and intrigue to the fanfictions.
One reason is the potential for new storylines. Since it's a departure from the original male - male relationship in the show, it allows for different relationship dynamics. The female dean can bring a whole new set of emotions and actions to the story, and her interactions with Castiel can be explored in unique ways. Also, fans like to see different versions of their favorite characters, and this fanfiction offers that opportunity.
Another theme is the idea of identity. How does Castiel's female form change her perception of herself and how does Dean view her differently? It can lead to stories that are centered around self - discovery and acceptance. In some fanfictions, Castiel struggles with being in a female body and Dean helps her come to terms with it, which is a really interesting take on their relationship.
One common theme is friendship. Their bond, whether it's a platonic friendship or something more, is often explored. Writers like to show how they support each other through tough times.
One popular trope is the 'First Kiss' trope. It often builds up a lot of tension between Castiel and Dean before they finally share that first, passionate kiss. Another is the 'Forbidden Love' trope, as their relationship within the context of the show has many obstacles, and this is often explored in fanfiction with their kisses being something that goes against the norm or is kept secret.
One popular story could be 'The Bond Beyond Worlds'. It delves into a deeper connection between Dean and Castiel, exploring their relationship in a post - apocalyptic setting. The story is known for its intense emotional scenes.
The 'alternate universe' trope is quite common too. For example, there are fics where Dean and Castiel are in a modern - day high school setting instead of the supernatural world they're usually in. It gives a fresh take on their characters and relationship.
Well, 'The Unspoken Love' is also quite well - known. It's a slow - burn story where the kiss is the culmination of many small, tender moments between Dean and Castiel. It shows how their relationship has been building gradually, like a slow - growing flame.