Perhaps the Hulk's newfound interest in Tony fanfiction could inspire him to be more like Tony in certain ways. He might start trying to use his intelligence more, like Tony does, which could lead to some interesting character development. He could also try to protect Tony more because of his admiration from the fanfiction, creating new story arcs and relationships within the Avengers.
The story could develop with Tony trying to reason with Steve. Tony might use his intelligence to talk Steve out of whatever his plan is. He could point out the flaws in Steve's reasoning or show him evidence that he's been misled.
Tony may develop a darker side. The allure of the Infinity Stones' power could corrupt him. He might start to make decisions that are not in the best interest of the world but rather for his own gain or to satisfy his newfound thirst for power. This would create a lot of conflict, both within himself and with his friends, and add a whole new dimension to the fanfiction.
Well, it could imply that the Hulk, with his complex personality, has an interest in Tony Stark's character as portrayed in fan - created stories. Maybe he sees something in Tony's genius or his heroic yet flawed nature that fascinates him.
In some fanfictions, Hulk's presence can be a source of comfort for Tony. Hulk's simple and pure-hearted nature might make Tony feel safe, like having a gentle giant as a protector, which eases his mind and helps him sleep.
The theme could be love. Maybe Tony falls in love with someone and the story revolves around their relationship, the joys and sorrows of it.
If Hulk and She - Hulk are having a baby, their relationship will surely change. They might become more protective of each other. For example, Hulk could become more gentle around She - Hulk, showing a side of him that others rarely see. And She - Hulk might rely on Hulk more for emotional support. Their relationship could also face challenges. They may argue about how to raise the baby, considering their different personalities and ways of dealing with power.
One common theme is the exploration of their differences. Hulk's raw power and Tony's intellect are like two opposite poles, and fanfictions often play with how they can either clash or complement each other. For example, in many stories, Tony tries to use his tech to control or understand the Hulk better.
The fanfiction could start with their individual backstories that led to this trouble crying. Tony's past with his parents and his journey as a superhero has made him suppress his emotions. Peter, growing up without a father figure for a long time, has learned to be tough. As they work together more often, small incidents start to crack their emotional walls. For example, a kind word from a civilian they saved makes Peter's eyes water a bit, but he quickly holds it back. Tony notices and it makes him reflect on his own emotional state.
One way the storyline could develop is by having them face challenges related to their different natures. Hulk's uncontrollable rage at times and Caiera's more composed self might create some tension during the pregnancy. For instance, Hulk might accidentally cause a dangerous situation due to his lack of control, and Caiera has to calm him down.
Their relationship could develop into a mentor - mentee type. Hulk's vast experience in dealing with powerful foes could help Peter grow as a hero. Peter, in turn, could show Hulk the value of using strategy and intelligence in combat.