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.
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.
Maybe Wolverine is being mind - controlled. In some fanfictions, villains use mind - control devices or powers to make heroes act against their will. So, he might not be in his right mind when he decides to hurt Spiderman.
In some fanfictions, Tony might help Spiderman by providing him with advanced technology. For example, he could give Spiderman a new suit with enhanced features like better web - shooters or stronger defense mechanisms. This would help Spiderman in his battles against various villains.
The plot could start with Spider - Man getting seriously injured in a fight against a powerful new villain. Daredevil then steps in to protect Spider - Man while he recovers. He wards off other villains who try to take advantage of Spider - Man's weakened state.
He could lose his friendship with Spiderman, if Spiderman survives. Their relationship would be severely damaged, and it would be hard to repair the trust between them.
Well, Daredevil might use his combat skills to fight off some of the minor villains who are causing trouble for Spider - Man. He could also use his knowledge of the city's underworld to provide Spider - Man with useful information about the bad guys' plans. Since Daredevil has a good understanding of the criminal element in the city, he can share insights that help Spider - Man in his battles.
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.
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.
In Spiderman fanfiction, Flash might help when he gets involved in a situation where his actions indirectly aid Spiderman. However, he hurts a great deal. His attitude can make Spiderman feel isolated. Since Spiderman already has a lot on his plate, Flash's negative behavior adds to the stress. It can also make it harder for Spiderman to maintain his secret identity as Flash is always looking for ways to expose any weakness in Peter Parker.