Well, in some fanfictions, Hulk might physically stand in front of Spiderman to shield him from attacks. For example, if there are powerful villains shooting energy blasts at Spiderman, Hulk's huge body can act as a barrier.
One common plot device is a mutual enemy. There's a big bad villain that both Hulk and Spiderman have to face, and Hulk takes on the role of protecting Spiderman during the fight. For instance, a powerful alien invader.
One reason could be a misunderstanding. Maybe some villain has tricked Hulk into believing Spiderman is a threat. For example, the villain might have faked some evidence to make it seem like Spiderman was planning something bad against Hulk or his friends.
Spiderman's agility and web - slinging abilities could be combined with She - Hulk's super strength. For example, Spiderman could use his webs to create a net and She - Hulk could throw it with her great strength at enemies. Or Spiderman could swing She - Hulk around to gain more momentum for her attacks.
He might also use his webs to his advantage. He could try to web up Hulk's hands or feet to slow him down. Or he could create a web shield to block some of Hulk's attacks. For example, if Hulk throws a big rock at him, Spiderman could use his webs to create a net to stop the rock.
There could also be a plotline where they both enter a mysterious tournament. They have to fight other superheroes and villains in a series of battles. Along the way, they learn more about each other's capabilities and form a stronger bond.
One interesting 'Spiderman and She - Hulk' fanfiction could be one where they team up to fight a new supervillain in New York. In this story, Spiderman's agility and She - Hulk's strength complement each other, and they have to learn to work together despite their different fighting styles.
One common theme is the contrast between their powers. Hulk has raw strength and Spiderman has agility and webs. Fanfictions often play on how they can complement each other in battles.
Another plot could be a more personal story. Spiderman and She - Hulk start training together. During the training sessions, they learn more about each other's insecurities and strengths. Spiderman might be dealing with the pressure of being a friendly neighborhood hero and She - Hulk could be struggling with her dual identity. Through their friendship, they help each other grow as superheroes and as people.
One possible plot could be that they have to deal with the media frenzy. Spiderman's identity might be at risk of being fully exposed because of his new high - profile relationship with She - Hulk. They could also team up to fight villains who target them specifically because of their union, like a villain who wants to use their combined powers for evil.