Recommend some 'Dark Dean Winchester Castiel' fanfiction.

One common theme is the struggle between good and evil within Dean. Castiel is often portrayed as the guiding light trying to pull Dean back from the dark side. Another theme is sacrifice. There are often situations where either Dean or Castiel has to sacrifice something important for the other's sake.

One common theme is the contrast between the 50's era and the supernatural world. The 50's had a certain aesthetic and set of values, and when combined with the Supernatural elements, it creates an interesting dynamic. For example, Dean's more modern - day sensibilities might clash with the more conservative 50's society while he's on a hunt with Castiel.

A popular one is 'Wings and Leather'. It focuses on how Castiel's angelic nature and Dean's more rough - and - tumble hunter side complement each other. The fanfic shows their journey together, facing various challenges and growing closer as they do so. It's full of great action scenes as well as some really tender moments.

Yes, there are quite a few. You can start by looking on fanfiction.net or Archive of Our Own (AO3). For example, on AO3, there are stories that explore their relationship in different Supernatural - inspired settings, like them going on a hunt together in a new and mysterious location.

Well, 'Darkness Within Dean' is also a notable one. It takes Dean on a journey through his own darkness. It shows how he copes with the various dark elements that come his way, and it has some really interesting character development for him.

Fanfiction.net is a great place to start. It has a large collection of Supernatural - related fanfictions, including those about Dean and fem Castiel. Just use the search bar and type in their names.

There's also 'Dean, Castiel and Baby: A New Bond'. This fanfiction focuses on how Castiel, in his new 'baby' form, starts to understand human emotions better through his interactions with Dean. It has a unique take on their relationship and is quite engaging.

There's 'Hidden Desires' which is a great dean winchester lemon fanfiction. It has a really interesting plot that not only focuses on the romantic and more adult - themed aspects but also ties in the Supernatural world's lore and Dean's character development really well. It shows how his tough exterior can be melted by the right person.

Fanfiction.net could also be a good place to look. However, the tagging system there might not be as detailed as AO3, but it still has a lot of Supernatural - related fanfictions. Just use the search function and look for keywords like '50's', 'Dean Winchester', and 'Castiel'.

There's 'Castiel's Femininity' which is really a deep exploration of fem Castiel. It looks at how she navigates the world as a female entity while being in love with Dean. The story beautifully portrays their emotional connection. Additionally, 'Dean and the New Castiel' is a fanfic that starts with Dean's initial shock at fem Castiel and then progresses into a heartwarming story of acceptance and a growing relationship.