I'm not sure of specific 'tony ignores peter fanfiction' off the top of my head. But you can try searching on fanfiction platforms like Archive of Our Own. There are likely to be many works there that might match what you're looking for.
Peter may try to get Tony's attention back. He could show off his own skills or achievements in an attempt to remind Tony of his value. For example, he might go on a solo mission and do an amazing job, hoping that Tony will notice him again.
Well, it could severely strain their relationship. Tony might feel betrayed and hurt. He could start to question Steve's loyalty. Since Steve is ignoring him for Bucky, Tony might become resentful towards both Steve and Bucky. It could lead to a rift that's hard to mend in the story.
Peter could stand up to Tony. By showing his strength and not taking Tony's meanness lying down, he might earn Tony's respect. For instance, if Tony makes a snide comment, Peter could give a smart comeback that makes Tony see him in a new light.
One aspect to consider in 'possessive Tony and Peter fanfiction' is the nature of their relationship. It might explore themes of protection. Tony could be possessive in a way that he wants to keep Peter safe from the various dangers in the Marvel universe, like powerful villains.
Yes, there are likely some fanfictions out there with this premise. Fanfiction often explores unique and unexpected relationships between characters. Writers might create a scenario where Peter Parker is scared of Tony Stark for various reasons, like Tony's power, his temper, or some miscommunication between them.
Well, it could be that in the fanfiction, they argue about technology. Peter, being the brilliant young mind that he is, might have different ideas on how to use or develop Stark tech compared to Tony. Tony is more experienced and perhaps set in his ways, so when Peter challenges him, an argument ensues.
Well, a simple fanfiction idea could be that Peter loses his real father at a young age and Tony fills that void. Tony starts teaching Peter things like how to fix cars or build advanced technology, just like a dad would teach his son useful skills.
One possible fanfiction could be about Peter seeing Tony as a father figure. Maybe Peter gets into some trouble at school, like a bully situation, and Tony steps in to give him advice on how to handle it. Tony could share his own experiences of facing difficulties when he was younger, and through this, their bond as a sort of father - son duo deepens.