A plot twist could be that as he jumps out the window, he gets caught by some sort of anti - Spider - Man technology. This device could be from a new villain who has studied his movements. Then he has to figure out how to escape from it while suspended in mid - air.
Perhaps when he jumps out the window, he actually jumps into a time rift. He then finds himself in the past or future. In the past, he could meet a younger version of himself or his family members who are still alive. In the future, he might see the consequences of his actions in the present, which could be either good or bad and he has to find a way to change things.
Well, one possible plot twist could be that instead of falling, he discovers he can fly. Maybe it's a new power he didn't know he had. Another could be that he lands in a parallel universe where everything is different. For example, his enemies are his friends and vice versa.
The plot could twist when it turns out that the real danger the Avengers are in was set up by someone close to Peter. It could be a friend or a teacher who has been secretly working for a super - villain. Peter has to overcome the shock of this discovery and still find a way to save the Avengers.
Well, perhaps in the fanfiction, Peter's memories as an adult are still somewhat intact in his baby form. So he tries to communicate with his loved ones in his own baby - like ways, like making specific noises when danger is near or trying to write in a very clumsy way. This could lead to some really cute and interesting interactions.
Perhaps the female spider is a mutant spider. After biting Peter Parker, it causes his DNA to mutate in a different way than the original spider - man origin. He could start to transform into a half - spider creature at unexpected times, which would be a huge challenge for him to keep his identity secret and also control his new form.
One possible plot twist could be that the pregnancy is part of a villain's scheme. Maybe an enemy has found a way to manipulate their DNA to force the pregnancy, and Peter and Hippolyta have to find a way to reverse it while also dealing with the moral implications. Another twist could be that the pregnancy is a result of some sort of time - travel or alternate - reality mix - up. For example, they might be from different universes where such a union and pregnancy would not normally occur, but due to some cosmic event, they are now in this situation. A third plot twist could be that the pregnancy reveals a hidden power within their unborn child. This power could be something that both heroes and villains are after, putting the couple in a very dangerous position as they try to protect their future family.
One possible plot twist could be that Mystic has a secret identity or past that threatens their marriage. For example, she might be related to one of Peter Parker's enemies without knowing it. Another could be that a powerful villain tries to use their marriage as a way to get to Spider - Man. Maybe they put a spell on Mystic to make her turn against Peter.
One possible plot twist could be that Amora's Asgardian heritage causes problems. Maybe some Asgardian law or custom forbids her from marrying a mortal like Peter Parker. For example, the Asgardian council could oppose the union and send someone to stop it, creating a conflict for the couple to overcome.
Maybe MJ. She could be in the area and use her quick thinking. She might find a large awning or something to break his fall, or she could call for help from nearby superheroes like Daredevil who could swing in and save Peter.
One possible plot twist could be that when Peter lifts the hammer, it actually has a negative effect on him. Maybe it starts to corrupt him in some way because he's not fully ready to handle that kind of power. Another could be that it's all a trick by a villain who has somehow enchanted the hammer to make Peter think he can lift it, only to use it against him later.
One plot twist could be that Aunt May's death was part of a bigger plan by a villain. Maybe the villain wanted to break Peter and make him more vulnerable. Another could be that Aunt May left behind a secret that changes Peter's view of his family or his powers.
One possible plot twist could be that Peter's identity as Spider - Man is revealed to the public much earlier than in the original story. Since Tony Stark is his adopted father, he has to use all his resources and influence to protect Peter from the various threats that come with this exposure. This could lead to a lot of interesting scenarios, like Stark having to face off against some of his own business rivals who might want to use Peter's powers for their own gain.