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.
Maybe it's described as a very private moment. Tony might turn away from others, trying to hide his crying. His breaths could be ragged as he struggles to compose himself, but the tears keep flowing, betraying his inner turmoil.
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.
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.
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 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.
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.
Well, it could start with Percy being in awe of his famous uncle. Maybe Tony initially sees Percy as just another young relative but as time goes on, he realizes Percy has a unique set of skills or a great mind. They might start working on projects together in Tony's high - tech lab, gradually building a closer bond like a mentor - mentee relationship that evolves into a more equal partnership over time.
In fanfiction, Tony Stark's nightmares are often portrayed as intense and vivid. They can be filled with dark images of his past failures or potential future disasters. For instance, he might dream of his Iron Man technology falling into the wrong hands and causing mass destruction. This is a reflection of his constant worry about the consequences of his inventions.
He might become more power - hungry. Usually, he is a hero, but with the goal of taking over the world, he could lose some of his moral compass.
He might become more cautious. In the DC Universe, there are a lot of powerful and unpredictable entities. So, he could tone down his cocky side a bit.