Perhaps they get married in a secret ceremony because Peter is worried about his enemies using Jean as a target. Then, they have to deal with the secrecy and how it affects their relationship. They might also work together to fight crime in some way, with Jean using her own skills (which could be something like being a brilliant scientist or having some self - defense skills) to support Peter in his superhero duties.
Fanfiction.net is also a good place to look. Many writers post their works there. However, the search function might not be as refined as AO3. You might have to browse through different categories related to Spider - Man (since Peter Parker is Spider - Man) and look for stories that involve Jean DeWolf and the marriage aspect. It could be a bit of a treasure hunt, but it's worth it if you're really into this pairing.
One possible plot could be that Peter and Jean have a secret relationship. When Jean discovers she's pregnant, they have to figure out how to balance their superhero lives with impending parenthood. They might face challenges from their friends and the superhero community who either don't approve of their relationship or worry about how a baby will affect their crime - fighting abilities.
A plot could revolve around them hiding their relationship from the public at first. As they get married secretly, they have to deal with the difficulties of maintaining a double life. Peter's friends in the Marvel universe and Batgirl's allies in the DC world might start to suspect something, and they have to keep their secret while also saving the world together.
Well, it could be about them balancing their superhero lives and married life. Maybe they team up to fight a new villain that threatens their city while also dealing with the everyday challenges of being married, like who does the dishes or takes out the trash.
One possible plot could be them facing a super - villain together as a married couple. They combine their powers and skills, Peter's spider - like abilities and Rocketeer's flight and weaponry skills, to defeat the bad guy.
Perhaps they decide to start a family. Then the story could focus on how Peter tries to protect his family from his enemies while still being a loving husband. There could be a lot of drama as they face threats from villains who find out about his family.
In a Peter Parker x Elsa married fanfiction, the plot could start with their accidental meeting. Maybe Peter is on a mission in a place near Arendelle and stumbles upon Elsa. They are initially wary of each other but soon realize they share a kindred spirit. As they fall in love and get married, they face many challenges. Elsa may struggle with the idea of Peter constantly putting himself in danger as Spider - Man, and Peter may find it difficult to understand the political and magical aspects of Elsa's world. But through it all, their love for each other helps them overcome these difficulties.
One possible plot could be that they have to hide their marriage from the public because of Shriek's past and Peter's secret identity. They face challenges in keeping their relationship a secret while also dealing with super - villain threats.
It could be really interesting. Imagine Peter's quick - wittedness combined with Jean's powerful telepathy. Their married life might involve Peter using his Spider - Man skills to protect their home and family, while Jean uses her powers to keep their minds safe from threats. They could also have some really fun interactions with other Marvel characters as a married couple.
Well, perhaps the plot could involve an enemy who discovers their marriage and tries to use it against them. This could lead to a lot of drama and action. They would have to work together to protect their relationship and also save the day. Another aspect could be their cultural differences, Peter coming from a more scientific - based superhero world and Zatanna from a magical one, and how they navigate those differences within their marriage.