It could be a scientist who is jealous of Tony's inventions. He creates a device that causes the hiccups as a way to disrupt Tony and Peter. His goal might be to steal Tony's technology while they are distracted by the hiccup problem.
There could be a new villain in town who has the power to control people's bodies in strange ways, like causing hiccups. He targets Tony and Peter because they are the most well - known heroes. His plan is to use the hiccups to make them look foolish in front of the public and then take over the city while they are dealing with their personal issues.
Maybe an old enemy of Tony's from his past resurfaces. This person sees the hiccup situation as an opportunity to get revenge. They manipulate the situation to make the hiccups worse for Tony and Peter, hoping to weaken them enough to defeat them once and for all.
Well, perhaps it could be about Tony and Peter having some sort of adventure where hiccups play a strange role. Maybe they are in a world where hiccups are a sign of a special power, and they have to figure out how to control it while dealing with some sort of villain. It could also involve them learning about the origin of these hiccup - related powers in their universe.
It could be someone from Stark Industries who doesn't like the idea of Peter inheriting something. Maybe a rival within the company who sees Peter as an inexperienced kid and wants to take whatever Tony left for Peter for themselves.
Since I'm not familiar with 'Tony Peter Manultive' fanfiction, it's hard to say. But in general, common themes in fanfiction can include friendship, adventure, and overcoming challenges.
It could be a new villain who has the ability to manipulate minds. This villain could make Steve believe that he is a danger to Tony and Peter, causing him to leave. For instance, the villain might implant false memories or thoughts in Steve's head, making him think that his actions might accidentally harm them in the future.
It could also be that some of Thanos' followers or those who try to take advantage of the post - snap chaos become the main antagonists. For example, some of the rogue elements in the universe might see this as an opportunity to gain power and territory, and they would oppose the Avengers who are trying to restore order. So they could step up as the main threats in the fanfiction.
One possible main antagonist could be a villain who is jealous of Tony's resources and sees Peter as a way to get to him. Maybe someone like Justin Hammer, who could try to manipulate Peter into betraying Tony and Steve.
I'm not aware of any particularly popular ones with exactly this combination. Fanfiction is a vast world, and while there are countless stories about Tony and Peter, these specific elements might be a bit niche. It's possible that someone out there has written it, but it may not have gained mainstream popularity yet.
Well, for a fanfiction like this, it might start with Peter suddenly getting hiccups in the middle of a conversation with Tony. And Tony, being his usual self, decides to use this as an opportunity to manipulate the situation to his advantage, perhaps to teach Peter a lesson or just for his own amusement. However, this would be a rather unorthodox and fun take on their relationship in the fanfiction world.
I'm not sure specifically about 'Tony Peter Manultive' fanfiction. You could try searching on fanfiction websites like Archive of Our Own or FanFiction.net.
Maybe it's an old clock - maker named Mr. Grimsby. He has a dark past related to a cursed clock he once made. When he hears about Tony's interest in clocks, he fears that Tony will discover his secret. So he tries to stop Tony from delving deeper into the world of clocks by causing problems in Tony's life, like getting him fired from his job at the local clock shop.