There could be many authors. It might be a new and upcoming writer in the fanfiction community who just loves the relationship between Tony and Peter.
It could be an established fanfiction author who has written a lot about the Marvel universe. They might have decided to explore this specific scenario of Tony buying Peter stuff as a way to show their unique take on the characters' relationship. Maybe they want to add some heartwarming or interesting twists to the story.
It could also be that Tony buys Peter some things for his personal life. Such as some nice clothes or tickets to a cool event. This would be a way to show their bond outside of the superhero world. Tony might see Peter as a son - like figure and want to give him experiences that he missed out on in his own youth.
Maybe Pepper Potts could find out what Tony has done and rescue Peter. She might be able to talk some sense into Tony and make him release Peter.
Pepper Potts might appear. She could play a role in helping Tony take care of Peter, like making sure he has a proper diet and a comfortable living space in the Stark Tower. She might also be a maternal figure to Peter, giving him advice on relationships and growing up.
Maybe some supervillains who were enemies of Tony. They see Peter as a continuation of Tony's legacy and want to stop him at all costs. They might target Peter to get revenge on Tony, even though he's passed away.
Perhaps it's an older wizard who has been collecting stories about the great house - elves in the wizarding world for a long time. Dobby, being such a well - known and beloved elf, became the focus of this particular fan fiction. This author might have a deep knowledge of the history of house - elves and used that to create a rich backstory in the fan fiction.
One reason could be that Tony has a new project related to Peter's studies. He might want Peter to be involved in it, like a research project on some new material that could be used in Spider - Man's suit. So he calls him during school hours to discuss it.
Tony could be the team captain. As the captain, he has a special bond with the team members and might want to do something special to boost their morale. He would know what kind of surprises would really make an impact on them.
In this fanfiction, Peter may face the challenge of finding Tony in the first place. Siberia is a vast area. He might have to rely on his spider - sense or some clues to track Tony down. Additionally, if there are other superheroes or anti - hero characters in the area, they could either help or hinder Peter's mission. And, of course, the physical condition of Tony when Peter finds him could also be a big challenge. If Tony is severely injured, Peter has to figure out how to transport him to safety while being chased by enemies.
It could strengthen their relationship. If Tony is into Peter's fanfiction, he might be more in tune with the public's view of Peter, which could help him support Peter better.
In this fanfiction, Tony might also meet Loki. Loki could be either a friend or a foe to Tony. He might try to trick Tony for his own amusement or they could end up working together against a common threat to Asgard.