It would deeply affect Tony Stark. Tony has been like a mentor to Peter, so his death would be a huge blow. Tony might blame himself for not being able to protect Peter.
One possible scenario could be that Peter sacrifices himself to save others during a crucial battle in the Endgame - like situation in the fanfiction. Maybe he uses his powers to hold off a powerful enemy while the rest of the heroes complete a vital task.
One possible storyline could be that Peter Parker sacrifices himself to save the city from a powerful new villain. Maybe he uses all his strength and resources to stop a doomsday device, but at the cost of his own life. The city then mourns their fallen hero, and his friends and family are left to pick up the pieces. His death could also inspire a new generation of heroes.
Perhaps in the fanfiction, there is a malfunction in Peter's suit technology. It could be that the suit's power source goes haywire and causes an explosion that kills Peter. This could be due to some sabotage by a new enemy who targets Peter specifically because of his growing reputation as Spider - Man in the Homecoming universe.
Peter might initially be in a state of shock. He could isolate himself from his friends and the world around him, constantly replaying memories of Aunt May in his head. He may also feel a great sense of guilt, thinking that he could have done more to protect her.
Well, one possibility is that a new hero could emerge in his place. Maybe one of his friends or a previously unknown character with powers would step up to protect the city. For example, Miles Morales could become even more prominent earlier than in the regular storyline. The city would be in chaos without Spider - Man, so the police might have to step up their efforts in a new way.
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.
I'm not sure specifically about 'peter parker 5 1 fanfiction'. But there are many great Peter Parker fanfictions out there. You can try websites like Archive of Our Own. They have a vast collection of fan - made stories about Peter Parker that are really engaging.
Mary Jane Watson is often a common character. She might be Peter's love interest and support system as he navigates the complex Web of Life. Another one could be Aunt May, who provides the home - like and moral support to Peter. Also, villains like Doctor Octopus or Green Goblin can appear, as they often cross paths with Peter in his adventures related to the Web of Life.
It could be a vengeful criminal that Spider - Man has put away in the past. This criminal has spent years in prison plotting his revenge and finally gets the chance when Peter is vulnerable. Maybe he manages to ambush Peter in an alleyway while he's on his way home from school or work.