Well, it could mean that Dean is exploring different interpretations of his relationship with Castiel. Maybe he's curious about how fans see their dynamic.
Dean could get some new ideas about how to deal with the challenges they face. The fanfiction might offer creative solutions to their problems. He might also start to notice little details about Castiel that he hadn't paid much attention to before, like the way he looks at him or the things he says, which could change their relationship dynamic in a positive way.
One great 'female dean destiel' fanfic could be 'The Dean's New Perspective'. It offers a unique take on the characters where Dean is reimagined in a female role and the Destiel relationship unfolds in an interesting way. Another might be 'Female Dean in the Supernatural World' which delves deep into how a female Dean would interact with Castiel and the challenges she'd face in the Supernatural universe.
You can start by looking on fanfic platforms like Archive of Our Own (AO3). Just use the search terms 'female dean destiel' and browse through the results. The top - rated and most - commented ones are often good candidates.
I've read a fanfic where Dean's half - human nature led to some really interesting plot twists. In this story, he had to learn to control new powers that came with his changed state. It was exciting to see how the author incorporated the Supernatural lore into this new concept of Dean. It's called 'Half - Human Dean: New Abilities'.
One great fanfiction could be 'Buffy and Dean's Unexpected Journey'. It explores how they deal with the pregnancy in a world full of supernatural threats. It's really interesting as it combines the two different universes they come from and shows how they support each other during this challenging time.
A lesser - known but really good one is 'Dean Winchester's Kidnap Nightmare'. Here, the kidnapping is part of a bigger plot by an old enemy. The fanfic has a lot of action as Dean tries to fight back against his captors while waiting for Sam to rescue him. The dialogue in this story is quite engaging.
One interesting fanfiction with this concept might be 'The Forgotten Dean' on FanFiction.net. It explores how the other characters react to Dean with no memories and how he slowly tries to piece his life back together. It has some great character development and emotional moments.
Well, one unique feature is the combination of different universes. For example, when it crosses over with something like Doctor Who, you get time - traveling elements added to Destiel's story. Another is the new character interactions. When Destiel characters meet those from other shows or universes, it creates fresh and unexpected relationships.
One common theme is the exploration of forbidden love. Both Destiel (Dean and Castiel) and Sabriel (Sam and Gabriel) relationships often go against some sort of 'rules' in the Supernatural world. Another theme is sacrifice. Characters are often willing to sacrifice a great deal for their loved ones in these fanfictions.