Perhaps in the fanfiction, he fails to protect the world from a new and powerful threat. Tony always sees himself as a protector. If his inventions or plans don't work and many lives are lost, he would feel an overwhelming sense of guilt and that could lead to him crying.
One reason could be the loss of a close friend like Steve Rogers. Their complex relationship and the times they fought side by side, if Steve were to sacrifice himself, it would be a huge blow to Tony. He might cry out of grief and also regret for the times they had disagreements.
It could be related to his relationship with Pepper. If Pepper were in danger or they had a big fight and she decided to leave him. Pepper has been a very important part of his life. Her absence or the thought of losing her would surely make Tony emotional enough to cry.
A reason could be that Peter is reminded of Tony's last words to him. Those words were full of hope and trust in Peter. When Peter reflects on them, he is overcome with emotion and starts to cry as he feels the weight of Tony's expectations.
One possible scenario in such a fanfiction could be that Peter is crying because he misses Tony Stark after his death. Tony was like a mentor to Peter, and his absence leaves a huge void. Peter might be in the Avengers compound, looking at old photos or mementos of Tony, and the memories make him break down in tears.
The author could describe it as a moment of complete vulnerability. His eyes might be red - rimmed, and his face contorted with pain. The sobs could be racking his body as he finally lets out all the pent - up emotions that he has been hiding for so long.
One reason could be that he's frustrated with the leadership or the direction the Avengers are taking in the fanfiction. He might feel his ideas are not being heard.
Guilt. For example, if he fails to save someone he cares about. He'll feel responsible and that could lead to him crying.
In fanfiction, emotional distress can also be a factor. If something really bad happens, like the loss of a loved one or the destruction of his work that he has put so much effort into, the shock and grief could be so overwhelming that he faints. Additionally, he could be suffering from some hidden illness that flares up suddenly and causes him to faint.
Maybe he doesn't fully understand his powers yet. Tony Stark is a scientific genius, but new powers might be beyond his current understanding. He could be worried that if he reveals them too soon, he won't be able to control them properly and might cause harm. So, he chooses to hide them while he studies and figures them out.
One interesting fanfiction could be where Tony Stark cries after realizing the true cost of his superhero lifestyle on his personal relationships. He might break down when he sees how his actions have pushed away Pepper or Rhodey.
One possible scenario in a fanfiction could be that Peter Parker is trying to hide his emotions from Tony Stark. Maybe he's been through a tough situation at school, like being bullied, but he doesn't want to seem weak in front of his mentor. Tony, on the other hand, has his own issues with showing vulnerability. He's always been the strong, confident Iron Man. But perhaps he starts to notice Peter's struggle and tries to open up about his own past traumas to encourage Peter to let it all out.
The existence of tony stark suicide fanfiction might be due to a few factors. Firstly, it could be a creative exploration of the character's psychological state. Tony Stark was often in high - stress situations, and writers may want to see how far his mental state could be pushed. Secondly, in the context of the complex Marvel storylines, some might use it to show the consequences of certain events on his mental health. However, this type of fanfiction is not for everyone as it can be quite dark and may not align with the more positive aspects of the character that most fans enjoy.