A possible storyline is that they start to suspect there is a mole in the superhero community. They work together secretly to investigate, using their spider - senses to track down clues. Along the way, they face many false leads and dangerous situations. But as they dig deeper, they discover that the truth is far more complicated than they thought, and it might even put their own reputations at risk.
Perhaps a storyline where they get transported to an alternate dimension and have to find their way back home while also dealing with the differences in that world. In this dimension, the rules of physics or the power dynamics might be different, which creates new challenges for them. They might have to rely on each other more than ever and in the process, their relationship deepens.
A third storyline might be that there's a misunderstanding between Spider - Man and Deadpool. Deadpool is hired to do a job that Spider - Man thinks is wrong. So, they start off as enemies in the fanfiction. But as they fight and exchange banter, they realize they've been set up by a bigger bad guy and end up working together to take this real villain down.
The Vulture could also be a major antagonist. His ability to fly and his sharp talons pose a great threat. Maybe he teams up with some other villains in the fanfiction to take on the two spiders at once. He could be stealing valuable items from around the city and Spider - Man and Spider - Gwen have to stop him.
Perhaps there's a fanfiction where Spider Man and Spider Gwen accidentally swap powers. They have to learn how to use each other's abilities to fight crime. This would lead to some really funny and also challenging situations as they get used to different ways of web - slinging and sensing danger.
One common storyline is them facing an alternate - dimension threat. Since they both come from different versions of the Spider - Verse, there could be a menace that is messing with the fabric of their universes, and they have to work together to stop it.
One interesting storyline could be Spider Gwen and MJ teaming up to solve a mystery in their city. Maybe there's a new villain causing chaos and they use their unique skills and friendship to figure out who it is and stop them.
One interesting storyline could be Peter and Gwen teaming up against a new super - villain in their city. They could combine their unique powers and skills to outwit the bad guy. For example, Peter's spider - sense and web - slinging abilities along with Gwen's acrobatic skills and her own version of web - shooting.
Maybe in the fanfiction, Spider - Gwen gets lost in the future where Spider - Man 2099 exists. He has to help her get back to her own time while also protecting his own version of New York from the chaos her presence might bring. They could learn from each other's fighting styles and develop a unique bond in the process.
In some fanfictions, the spiderling could be from a future timeline and comes back to the present to help Spider - Man. This could involve him warning Spider - Man about a great danger that's coming and they have to work together to prevent it. Or perhaps Spider - Boy has a unique power that Spider - Man doesn't, like the ability to communicate with spiders on a deeper level. Their story could revolve around how they combine their powers to defeat a new breed of villains that are immune to Spider - Man's usual attacks. And there could also be a story where all three, spiderling, Spider - Boy, and Spider - Man, are brought together by a mysterious force and have to figure out why and what their combined purpose is.
One interesting storyline could be about Spider Man facing a new villain that was created specifically for the fanfiction. This villain might have powers that directly oppose Spider Man's, like the ability to nullify his spider - sense.
One great storyline could be Peter and Gwen teaming up against a new super - villain in the city. They could use their combined skills and intelligence to outwit the bad guy. For example, the villain might have the ability to control technology, and Peter and Gwen would have to find a way to stop him without getting caught in the digital web.