One possible plot could be that Peter and Gwen have a child who discovers their superhero/vigilante past. The child might start to show signs of having special abilities like Peter, and they struggle to keep it a secret at school while also trying to understand their newfound powers. Maybe they find an old enemy of Peter's is back and they have to team up with their parents to stop the threat.
The Vulture could also be a main villain. He might have a new technology that he believes can only be perfected with the DNA of Peter and Gwen's child. He stalks the family, waiting for the perfect moment to strike and snatch the child away for his evil experiments.
One common scene could be at a school event. Peter is chatting and laughing with another girl, and Gwen sees this from afar. Her face might turn a bit red, and she clenches her fists slightly, showing her jealousy. Another example could be when Peter is out saving a girl as Spider - Man. Gwen reads about it in the news and feels a pang of jealousy thinking about how close Peter might have been to that girl during the rescue.
In many fanfictions where Gwen Stacy is jealous for Peter, it often stems from her deep love for him. She might see Peter interacting with other girls, like Mary Jane perhaps, and that triggers her jealousy. It adds an interesting layer of complexity to their relationship as it shows her insecurities and the intensity of her feelings for Peter.
They could have a fanfiction where Spider Gwen and Peter Parker are forced to compete in a series of challenges set by a mysterious figure. This competition tests their physical and mental abilities. In the end, they realize that they are stronger together and decide to team up against the real enemy, the one who set up the competition in the first place.
In certain comic continuities, Gwen Stacy is alive. However, her status has changed throughout different comic arcs and reboots. Sometimes she's been brought back through various means in the fictional comic world.
Gwen Stacy is not trans in the comics. The character has been presented in a conventional gender role throughout the comic series. There have been no storylines suggesting otherwise.
Gwen Stacy was an important figure in the Spider-Man comic universe. She was smart, kind, and had a complex relationship with Peter Parker. Her death had a huge impact on the story.