One common theme is the family - like relationship. Tony seeing Peter as a son figure and using'sweetheart' as an affectionate term. Another could be the protection aspect, where Tony is protective of Peter and the endearment shows that.
There are quite a few fanfictions where Tony might call Peter sweetheart. You can check on popular fanfiction platforms like Archive of Our Own. Just search for the tags related to Tony and Peter and look for the specific use of 'sweetheart' in the story descriptions.
Yes, there might be. You can check fanfiction websites like Archive of Our Own or FanFiction.net. Just search for 'tony calls peter bubba' on their search bars.
Perhaps Peter is a bit annoyed at first. He's trying to focus on class and here's Tony calling. But then when he realizes it might be something important, he starts to pay more attention to the call, all while being cautious not to get caught by the teacher.
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.
It's popular because both characters are beloved. Tony is a complex and cool character, and Peter is this endearing young hero. Their relationship in the official stories is mentor - mentee, so taking it to a father - son level adds a new depth.
One great 'Peter calls Tony dad' fanfiction is 'Stark's Heir' which beautifully explores their father - son relationship. It has some really heartwarming scenes where Peter looks up to Tony as a father figure and Tony steps into that role wholeheartedly.
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.
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.