What could be the possible reasons in a 'Peter Parker leaves MJ for Gwen Stacy' fanfiction?

Yes, there are quite a few out there. Some explore the idea in really interesting ways, like how Peter's relationship with Gwen might develop differently from his relationship with MJ. You can usually find them on popular fanfiction websites by using relevant tags.

One possible storyline could be that Peter feels he has to leave to protect MJ and their unborn child from his dangerous life as Spider - Man. He might think that his enemies will target them if he stays.

One possible reason could be that Peter is keeping secrets from MJ about his Spider - Man identity. In many versions, his secrecy creates misunderstandings and MJ might feel left out or betrayed, leading to her crying.

Well, perhaps in the fanfiction, Peter and Gwen find an abandoned baby with some sort of special powers. They decide to take the baby in and raise it as their own. As they do so, they have to face various challenges. Enemies might be after the baby because of its powers. Peter uses his skills as Spider - Man to keep the baby safe, while Gwen provides the emotional support and care. They grow together as a family in the face of these difficulties.

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.

It could be the Green Goblin. He might see the baby as a way to get back at Peter. Maybe he thinks that by kidnapping the baby, he can force Peter to make some sort of deal or just to cause him great pain.

Well, 'The Second Chance' is a great one. It focuses on the idea of Gwen getting a second chance at life and how she and Peter deal with it. The story has great character development and really delves into their emotions.

One possible reason could be a difference in ideology. Maybe Peter Parker feels that Stark's methods are too extreme or not in line with his own moral compass. For example, Stark might be involved in some projects that Peter doesn't agree with, such as using certain unethical technologies in the pursuit of justice.

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 of the most appealing aspects of Peter Parker and Gwen Stacy's romance in fanfiction is the way it often delves deeper into their emotional connection. In many stories, we see their relationship develop from a shy attraction to a deep, passionate love. For example, some fanfictions focus on the moments between them that were not fully explored in the original comics or movies, like their study dates where they share their dreams and fears.