One common theme is mentorship. Tony often takes on the role of a mentor to baby Peter, guiding him in various aspects like academics, using his powers, and moral values. Another theme is protection. Since Peter is a baby or very young in these fictions, Tony is usually very protective of him.
Peter could respond with a bit of humor. He might make a joke like 'I'm not a baby, Mr. Stark, I can handle myself!' while secretly enjoying the affectionate name. This would show his growing confidence in his relationship with Tony, being able to tease him back.
One possible plot could be that Tony takes on a fatherly or mentor - like role. He might call Peter 'baby' in a protective way, like when Peter gets into a dangerous situation during a mission. Tony scolds him gently while using the term 'baby' to show his concern for Peter's well - being.
One popular 'Tony and Baby Peter' fanfiction might be 'Peter's New Start'. It shows Tony taking in a young Peter and guiding him in his new life. Another could be 'Baby Peter's Adventures with Tony' which has a lot of cute moments of them interacting and Tony being a mentor to Peter.
Well, it could be that in the fanfiction, baby Peter shows some extraordinary abilities even at a very young age. Tony Stark, being the genius he is, wants to study Peter to figure out how his powers work. But at the same time, he also becomes very protective of Peter like a father figure. They might have some cute moments where Peter tries to imitate Tony's high - tech gadgets with his baby toys.
Well, the story might start with Tony stumbling upon baby Peter by some chance, like during a visit to an orphanage or a scientific event. Tony, being the genius and having a soft heart deep down, feels an instant connection. He adopts Peter and begins to groom him to be a great person. Peter grows up learning from Tony's vast knowledge of technology and also gets exposed to the Avengers world early on, which shapes his view of heroism.
In this fanfiction, Tony Stark's character would develop in several ways. Initially, he might be a bit clumsy at parenting, but as time goes on, he'd become more attuned to Peter's needs. His focus would shift from just his own inventions and heroics to also considering Peter's future. He'd become more selfless, as he'd be willing to sacrifice his time and resources for Peter's well - being. He might also become more cautious in his actions, knowing that he has a young life depending on him.
The relationship could be like a father - son bond. Tony would be very protective of Peter. He might hold Peter in his arms and talk to him about the future, about how Peter could be a great hero one day.
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.