There could be a fanfiction where Black Widow has to train Spider - Man in some new combat techniques. Since she has more experience in hand - to - hand combat and stealth, she teaches him how to be more efficient in close - quarters fighting. This story could also explore how Spider - Man's superhuman abilities interact with the skills he's learning from Black Widow.
One interesting fanfiction could be where Spider - Man and Black Widow team up to take on a new villain in New York. They combine their unique skills, with Spider - Man's acrobatics and web - slinging and Black Widow's combat expertise.
There are fanfictions that explore the relationship between Spider - Man and Black Widow in a more emotional way. For example, a story where Black Widow acts as a mentor to Spider - Man, guiding him not just in combat but also in dealing with the emotional turmoil of being a superhero. She could share her own experiences of growing up in a harsh environment, and Spider - Man could learn from her wisdom and tenacity.
One common theme is the 'unlikely partnership'. Since they are from different parts of the Marvel universe, seeing them come together is always interesting. Another theme is 'mentorship', like Black Widow guiding Spider - Man in certain situations.
A more emotional storyline could be that Spider - Man discovers some secrets from Black Widow's past. Maybe he stumbles upon some information about her time in the Red Room while on a mission. This discovery could make him see her in a new light and they could form a deeper bond as they deal with the revelations together.
You can write about their teamwork in fighting villains. For example, describe how they combine their unique skills to take down a powerful enemy. Spider - Man's agility and web - slinging ability paired with Black Widow's combat training and strategic thinking could make for an exciting adventure story.
One idea could be that Black Widow and Spider - Man are forced to team up on a mission in a foreign city. They have to deal with a new villain who has the power to manipulate technology and is causing chaos. Spider - Man uses his agility and web - slinging skills while Black Widow uses her combat expertise and espionage knowledge to track down the villain.
Another could be a story where Spider - Man has to protect Black Widow when she's on a dangerous solo mission that goes wrong. It could explore how their different worlds collide and how they learn to trust each other more deeply. They might start with some initial misunderstandings due to their different approaches to superheroing but then grow to respect and rely on one another.
There might be a fanfic that explores a romantic relationship between them in an alternate universe. In this story, they have to hide their relationship from the other Avengers while still fighting crime together. It could show how they balance their personal feelings with their superhero duties.
One common theme is the idea of opposites attract. Spider Man is often portrayed as more of an upbeat, youthful hero, while Black Widow has a darker, more mysterious past. Their different outlooks can create an interesting dynamic.
Character development is key. Maybe Spider - Man becomes more serious and strategic under Black Widow's influence, while Black Widow becomes more open and trusting. Their relationship should grow and change throughout the story. Also, the setting can add a lot. If it's set in a different country or during a major event in the Marvel universe, it can make the story more engaging.