Another theme is the exploration of their dual identities. Peter has to balance his life as a student and Spider - Man, and Bruce has his own struggles with the Hulk. Fanfictions often explore how they can relate to each other's problems and support one another in dealing with their identities.
One common theme is mentorship. Bruce could be a mentor to Peter, guiding him with his scientific knowledge. For example, in some fics, Bruce helps Peter with his web - shooter technology.
I really like 'Partners in Science'. In this fanfiction, Peter and Bruce start working together after Peter discovers some strange radiation that he can't figure out on his own. Bruce helps him analyze it, and their friendship grows throughout the story. It has some really cool action scenes where they have to fight off bad guys who are also interested in the radiation.
Perhaps they would team up to fight a common enemy. Peter's agility and combat skills combined with Bruce's Hulk - like strength could make for a formidable duo. They could be facing a villain who is both a scientific threat and a physical menace.
One popular theme is their scientific collaborations. Since both are brilliant minds in the MCU, fanfictions often explore how they would work together on projects, like inventing new technologies or solving complex scientific problems.
If Peter is Banner's son in fanfiction, there could be a great deal of scientific exploration between them. Peter could learn a whole new level of science from Banner, and they could collaborate on projects. This would enhance Peter's intelligence even more. Also, Peter might struggle with the idea of being related to the Hulk. He'd have to deal with the public perception of his father and how that affects him as Spider - Man.
One popular theme is loss. Peter could be mourning the death of someone close to him, like Aunt May or a fellow superhero. This makes him break down and cry as he tries to cope with the emptiness. Another theme is self - doubt. He might question his abilities as Spider - Man, which leads to him crying in despair. For example, if he fails to save a civilian, he starts to think he's not worthy of the mantle. Also, unrequited love is a common theme. Peter might have feelings for someone who doesn't feel the same way, and this causes him to cry in private.
One popular theme is the power - sharing or power - combination theme. Writers like to explore how Peter's physical powers and Raven's psychic powers could work together in different situations, like in a battle against a powerful villain. Another theme is the culture - clash theme, as they come from different fictional backgrounds.
The theme of protection also pops up a lot. His adoptive family will often go to great lengths to protect Peter, and in turn, he'll want to protect them. This creates some intense and emotional storylines, especially when his identity as Spider - Man is at risk and his family has to step in to keep him safe.
A common theme could be the struggle between his normal self and his Hulk side during the pregnancy. He has to manage his emotions and powers carefully.
Their first meeting could be a bit awkward. Peter might be a bit star - struck seeing Bruce, and Bruce could be initially cautious around this young, super - powered kid. Maybe Peter accidentally stumbles into Bruce's lab while looking for something related to his own science project.