Peter's own quick thinking helps him survive. He could use his surroundings during the fall. For example, if there are ledges on the building, he can use them to break his fall. He can also calculate the best way to land, using his acrobatic skills that come with his powers, so that he minimizes the damage to himself.
One possible reason could be to save someone. Maybe there was a threat in the building that he could only stop by jumping off and using his powers in mid - air. For example, a bomb was about to go off and the only way to defuse it was to jump from a certain angle.
Perhaps in this fanfiction, Peter has some new power or gadget that he's testing. So when he jumps off the building, instead of the usual web - swinging, he activates this new ability which allows him to fly or at least glide to the ground in a very cool and unexpected way.
Peter could be an ordinary person who has been given extraordinary powers for some reason in this fanfiction.
He could be trying to save someone. Maybe a civilian is falling from a higher floor, and Peter jumps off to catch them and use his webs to swing them to safety.
One great fanfiction is 'Peter Parker: The Avenger's Secret Weapon'. In this story, Peter uses his intelligence and spidey - sense to help the Avengers in unexpected ways. It has a lot of action scenes and great character interactions.
His best friend could be a main character. This friend might be the one who tries to understand why Peter did it and be there for him during his recovery if he survives. Maybe the friend was the only one who knew Peter was struggling before the jump.
Well, it could be that Peter starts off as a regular guy who is just a huge fan of the Avengers. Maybe he follows all their news, collects their merchandise. One day, he gets a chance to meet them somehow, like through a Stark Industries internship. Then he gradually proves himself useful to them and they start to train him. Eventually, he becomes part of the team, with his own unique skills like his spider - powers adding to the Avengers' strength.
Yes, there might be. You can check fanfiction websites like Archive of Our Own or FanFiction.net. Just search for 'Peter loves ducks' within the Avengers fanfiction section on those sites.
Maybe Thor. Peter has never seen someone as powerful as Thor with his hammer and god - like abilities. Thor's larger - than - life presence could be really fascinating for Peter.
One possibility could be that Peter is extremely stressed at school. Maybe he's being bullied or facing overwhelming academic pressure. So, in a moment of despair, he jumps off the school roof. But then, he could miraculously survive and this event could be a turning point for him to face his problems and seek help.