Perhaps the 2023 Spider - Man meeting in the 2018 fanfiction is about a celebration of the victory over a major villain. They come together to honor those who have fallen in the battle and to ensure that the peace they've achieved is maintained. They might also discuss how to prevent the rise of new villains in the future.
Another storyline could be that the 2023 meeting is a result of a distress signal sent by one of the Spider - Men. His universe is in danger, and he calls for help from his counterparts. When they meet, they first have to overcome their differences and egos to work together to save his universe. There could be internal conflicts among them at first, but they eventually realize the importance of unity in the face of a greater threat.
Perhaps Spider - Man starts to train harder in order to be better prepared for future threats. He could seek out new mentors, like Doctor Strange if he's still around. He might also get involved in some sort of community rebuilding effort, using his powers to help the common people who are now in a state of chaos and fear.
One possible storyline is that they are brought together by a powerful villain who is a threat to both their worlds. They have to team up to defeat this enemy, and during their time together, they develop feelings for each other. Another could be that Valkyrie is sent to Earth to train Spider - Man in some Asgardian combat techniques, and as they train, a romantic connection forms. Or perhaps Spider - Man accidentally gets transported to Asgard, and Valkyrie takes him under her wing. As he tries to find his way back home, they fall in love.
One possible storyline could be that Spider Man and Lady Shiva team up to take on a common enemy. Maybe a powerful new villain has emerged in the city, and their combined skills are needed to stop him. Spider Man's agility and web - slinging combined with Lady Shiva's martial arts expertise would make for an interesting dynamic.
There could be a storyline where Spider - Man uses his scientific knowledge to upgrade the Avengers' technology. Or perhaps a story where he has to choose between his loyalty to the Avengers and protecting his own neighborhood. This internal conflict could add depth to the fanfiction. Also, he might team up with Black Widow for a stealth mission where his agility and her skills combine for a successful operation.
One possible storyline could be that Spider - Man, while fighting a new villain, is hit by a strange ray that turns him into a kid. He then has to figure out how to reverse the effect while still trying to protect the city. As a kid, he might have to rely more on his wits and less on his physical strength, which could lead to some really interesting situations.
Maybe in the 2018 fanfiction, the 2023 Spider - Man meeting could be a reunion of all the Spider - Man versions from different universes. They might come together to fight a new and powerful villain that threatens all the universes.
A great fanfiction idea could be that Spider - Man and Nightwing meet at a superhero convention. They both go there in civilian guise, but they sense something different about each other. Later, when trouble breaks out at the convention, they reveal their identities and work together to stop the bad guys. This would be a fun way to show their different personalities in a non - combat situation first.
One possible storyline could be that Spider - Man's body is magically transformed into a more 'girly figure' and he has to deal with the new physical limitations and public perception. He might struggle to perform his usual acrobatic stunts as easily and face teasing from villains. Another could be that he enters an alternate dimension where having a girly figure is the norm for superheroes, and he has to adapt to their different standards of heroism.
In the 'Spider - Man Miles Morales After Story', there could be a storyline where Miles is recruited by a bigger organization of superheroes. This would expose him to new heroes, new threats from a wider scope, and force him to step out of his comfort zone in his neighborhood and into the larger superhero world.
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.