It could be that Tony has noticed Peter is having trouble with a particular subject, like math. So, he calls Peter during class to offer some extra help or to share some useful study tips he has. Tony might be a bit of a prodigy in that area and wants to see Peter succeed.
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.
Perhaps there's a school event coming up, like a tech fair. Tony, being the tech - savvy guy, calls Peter to ask if he wants to join him in creating an amazing invention for the fair. They could start brainstorming ideas right there in class, ignoring the fact that they should probably be paying attention to the teacher.
Well, one possibility is that Peter gets in trouble for answering the call during class. Maybe he tries to be sneaky but the teacher catches on. For example, he could be whispering into the phone and the teacher hears him and confiscates his phone.
One possibility is that Peter gets really flustered. He might be in the middle of paying attention to the teacher when Deadpool calls, and his first reaction could be to try and hush Deadpool. Since Peter is often portrayed as a responsible student, this unexpected call could throw him off his game in class.
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.
It might be that Tony has some exciting news about a new internship opportunity in the field of engineering. He knows Peter is also interested in that area and calls him during class to tell him all about it and see if he wants to apply together.
The story could focus on Tony's downward spiral into guilt and self - blame. He might isolate himself from the other Avengers, feeling that he should have been the one to die. His technological advancements could take a dark turn as he tries to find a way to bring Peter back, perhaps even dabbling in dangerous and unethical science.
Perhaps Steve is calling Peter to warn him about something in class. For example, there could be a surprise test that Peter doesn't know about yet. Steve might be a good friend who wants to give Peter a heads - up so he can be prepared. In fanfiction, this kind of scenario can add an element of friendship and drama within the classroom setting.
In a fanfiction where Steve calls Peter in class, we might expect some sort of comical moment. For instance, Peter could be daydreaming and Steve's call startles him, causing him to make a funny noise or reaction that amuses the whole class.
In this fanfiction, Harley might be calling Peter in class to ask for help with a difficult assignment. Maybe Peter is really good at a certain subject and Harley is desperate for his assistance during class time.
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 would probably be shocked at first. I mean, getting a call from Deadpool in the middle of class is not an everyday occurrence. He might quickly look around to see if anyone noticed his phone ringing.