One possible fanfic could start with Spiderman being transported to the Destiny universe. He might be confused at first, seeing all the strange alien landscapes and advanced technology. Maybe he teams up with a Guardian to fight off the Fallen. He uses his web - slinging abilities to navigate the complex terrains of Destiny's planets, while the Guardian provides firepower. Together, they become an unstoppable force, protecting the innocent in this new and dangerous world.
A cool plot could be that the symbiote from Spiderman's world somehow gets linked to a Hive entity in the Destiny universe. This causes chaos as the combined powers create a super - powerful and evil being. Spiderman has to team up with a Warlock to find a way to separate the two and stop this new threat. The Warlock uses their knowledge of the Darkness and the Light, while Spiderman uses his physical abilities.
In a dark Gotham alley, Batman is on patrol when a strange web shoots across his path. Out of the shadows emerges Spider - Man. 'Hey, Bats! Heard this city could use some help.' Batman, initially cautious, realizes they could work together. They team up to take on a new villain who has a blend of high - tech gadgets and super - strength. Spider - Man's quips lighten the mood as Batman strategizes. Together, they swing and glide through Gotham, finally defeating the bad guy.
One way a Spiderman x Artemis fanfic could start is with Spiderman swinging through the city and suddenly getting zapped into Artemis' realm. He's confused at first but then realizes he has to work with Artemis to get back home. Along the way, they start to respect each other's abilities and form an unlikely friendship. They might even combine their powers to defeat a villain who is trying to disrupt both their worlds.
One possible story in a Spiderman x Deadpool Homecoming fanfic could be that Deadpool decides to crash Peter Parker's Homecoming dance. He shows up in his usual flamboyant style, causing chaos and confusion among the students. Spiderman has to both keep his identity a secret and deal with Deadpool's antics. It could be a really fun and comical take on the Homecoming event, with lots of banter between the two characters.
A batman and spiderman crossover fanfic could be about them teaming up to fight a common enemy like the Joker and Green Goblin who have formed an alliance. They would combine their unique skills, Batman's detective skills and martial arts with Spiderman's agility and web - slinging.
One idea could be a Spiderman and Iron Man crossover. Spiderman could team up with Iron Man to fight a new, powerful villain. Maybe they have to combine their tech and skills, like Spiderman using his web - slinging abilities along with Iron Man's high - tech gadgets to take on an enemy who can manipulate electricity.
Another possibility is that there is a villain who is stealing technology from Stark Industries (where Spiderman sometimes gets his tech) and ancient artifacts from Wonder Woman's homeland. They are both independently investigating and then cross paths and decide to work together to stop the thief.
I'm not sure if there is a specific 'Black Widow' and 'Spiderman' crossover fanfic that involves 'lemons'. Fanfics can cover a wide variety of themes and combinations, but the 'lemon' aspect often implies some sort of adult or inappropriate content. There are many fanfic platforms out there, but it might be difficult to find one that combines these two superheroes in that way due to the nature of the 'lemon' concept.
One idea could be that Spiderman gets caught in the middle of a conflict between the X - Men and one of their powerful enemies. Maybe Magneto is causing chaos in New York and Spiderman tries to stop him on his own at first, but then realizes he needs the X - Men's help. The X - Men, in turn, are initially skeptical of Spiderman but come to respect his skills.