One possible plotline could be them fighting supernatural threats together. Since both Harry and Dean are used to dealing with the supernatural in their respective universes, they could combine their skills and knowledge. For example, Harry's magic could be a new weapon against the demons Dean usually hunts.
One popular fanfiction site is Archive of Our Own (AO3). You can search there using the tags 'fem Harry' and 'Dean Winchester' to find stories where they are married. There might be some really creative and well - written ones that explore their relationship in interesting ways.
One common theme is self - discovery. Since it's a fem version of the character, often the story focuses on her finding out who she is in a world that may have different expectations of her compared to the male version. For example, in some fics, she has to navigate through male - dominated spaces and prove herself.
One great fem Harry Dean Winchester fanfiction is 'Fem Harry's New World' on FanFiction.net. It has an interesting take on the character in a new and exciting setting.
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.
Another theme is protection. Dean is always very protective in the fics. He wants to keep Bella safe from all the demons and monsters. And Bella often tries to prove that she can take care of herself too. This creates a lot of interesting plot points. In some stories, this leads to conflicts between them that they have to work through as a married couple.
In a fanfiction about Hermione and Dean Winchester getting married, perhaps it could involve a time - travel element. Hermione, being a skilled witch, could accidentally end up in Dean's time and place. Dean, being the protector he is, would initially be wary but soon realize Hermione's good intentions. As they work together to find a way for Hermione to return home, they fall in love. And due to the nature of their bond, they decide to get married, bringing together two very different worlds.
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.
A frequent theme is the reaction of his friends and family to his marriage. In many fanfictions, Sam has a big role in how he adjusts to Dean's new situation. Also, the idea of building a normal life in the midst of the chaos of the supernatural world is quite common.
One great fanfiction is 'Dean's New Chapter'. It shows Dean's journey into married life in a very heartwarming way. It delves into how he adjusts to having a partner and the new responsibilities that come with it. The writer does a wonderful job of staying true to Dean's character while also creating a believable relationship.