One possible plotline could be that Mary Jane somehow gets transported into the Harry Potter universe. She might be mistaken for a Muggle - born witch and have to adapt to life at Hogwarts. She could introduce some of her 'Spider - Man' world ideas, like courage in the face of danger, to the students there.
One common theme could be the clash of two different worlds. Harry comes from a world full of magic, while Mary Jane is from a more normal, modern world. So, the exploration of how they deal with each other's worlds is often seen.
Finding 'harry potter and mary jane fanfiction' might be a bit of a challenge because they belong to different franchises. But one way to go about it is to first think about how these two characters could interact in a fictional setting. For example, if it's a magical - superhero crossover, what kind of powers would they combine? Once you have an idea in your head, you can look for stories that might match that concept on popular fanfiction platforms. Another option is to follow some well - known fanfiction writers who are known for their creative crossovers and see if they've ever delved into this particular combination.
Well, one good place to start looking for such fanfiction could be Archive of Our Own (AO3). They have a vast collection of fan - created works. You can search using the relevant tags like 'Harry Potter' and 'Mary Jane Watson' and then browse through the results to find the ones that seem interesting.
In some Spider - Man fanfictions, Mary Jane being pregnant can add a whole new layer of drama. It could mean that Spider - Man has to balance his superhero duties with being a soon - to - be father. Maybe he'll worry about protecting his family more than ever, and there could be new villains who target his unborn child or Mary Jane to get to him.
One possible fanfiction could involve Jane Foster using the Bifrost to accidentally end up in the Harry Potter universe. Maybe she arrives at Hogwarts and is mistaken for a new kind of magic user. The students and professors would be intrigued by her Asgardian technology and different kind of magic. She could potentially teach them about the Nine Realms while also learning about the wizarding world's magic.
One great fanfiction could be where they team up to solve a mystery in New York that the regular superheroes overlooked. They use their unique skills and knowledge of the city to their advantage.
One possible reason could be that Mary Jane has different life goals. Maybe she wants to focus on her career and she sees Peter as a distraction. For example, if she is aiming for a high - profile job in journalism or acting, she might think that a relationship with Peter would take too much time and energy.
Mary Jane's best friend could be a main character. This friend could be there to offer advice, help out with the baby, and also have her own sub - plot. For example, she might be dealing with her own relationship issues while seeing Mary Jane's new family situation.