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.
Well, in this fanfiction, Tony might be calling Peter to give him some important news. Maybe it's about a new mission or some advanced technology he wants Peter to check out at Stark Industries. It could also be that Tony is just checking in on Peter, like a mentor looking out for his protege.
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.
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.
One possibility is that Tony calls Peter to discuss an upcoming science project. Maybe they need to work together and Tony wants to plan out their tasks in class so they can start right away after school.
Maybe Tony scolds Peter for disobeying a safety protocol during a mission. Peter, who looks up to Tony, is deeply hurt by the scolding and starts to cry.
You could also try Tumblr. There are often fanfiction writers and fans who post and discuss their works there. Look for tags related to Tony, Peter, and the specific 'bubba' nickname. Additionally, some independent fanfiction blogs might have stories with this element. You just need to be patient and search thoroughly.
One possible plot is that the baby's birth brings a new sense of hope and purpose to Tony and Pepper. They start to see the world in a different light, more focused on creating a better future for their child. There could be a sub - plot where they face some challenges from the media or some villains who see the baby as a target or a symbol. But through their love for each other and the baby, they overcome all the obstacles.
Well, perhaps in the fanfiction, Tony kidnaps Peter because he believes Peter has some sort of secret that could endanger the world if it gets out. He might be trying to protect the world in his own, extreme way. And Peter is left confused and scared, having to figure out how to convince Tony he's on the right side.
Well, perhaps Tony has some sort of misunderstanding. Maybe he thinks Peter has betrayed him in some way, so he kidnaps Peter. But later, as he realizes his mistake, he tries to make it up to Peter.
Well, one possibility is that Tony could replace Peter in a mission. Maybe Peter gets injured and Tony steps in to finish what Peter started. It could also be about Tony taking over Peter's role in a social or school setting within the fanfiction world.