Well, perhaps Rhodey is being attacked by a group of enemies who have him outnumbered. Peter, being the friendly neighborhood Spider - Man, notices the situation and quickly jumps into action. He uses his agility to dodge the attacks aimed at him and then disarms the attackers, saving Rhodey. Or it might be that Rhodey is in a dangerous situation where he's exposed to some harmful energy or gas, and Peter creates a web - shield around Rhodey to protect him.
One possible scenario could be that during a chaotic battle in the Civil War setting, Rhodey's suit malfunctions and he's about to crash. Peter, with his enhanced senses and web - slinging abilities, swings in just in time to catch Rhodey and safely land him. Another could be that Rhodey is trapped under some rubble from a destroyed building, and Peter uses his strength to lift the rubble off Rhodey.
It could be some anti - superhero groups who see both Peter and Rhodey as threats to their version of order. Maybe they have advanced weaponry designed specifically to take down superheroes like Rhodey's high - tech suit and Peter's superhuman abilities.
One great story could be 'Unexpected Encounter' where Rhodey and Peter cross paths during a city - wide emergency. In this fanfiction, Rhodey is initially skeptical of Peter's abilities but soon realizes his potential.
You can start by looking on popular fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions from various fandoms, and you're likely to find quite a few stories about Rhodey meeting Peter there.
One possible plot twist could be that the real danger was not what it seemed at first. For example, while the Avengers thought they were being attacked by a supervillain, it was actually a test set up by a greater power. And Peter discovers this truth while trying to save them. Another twist could be that Peter has to sacrifice one of his powers temporarily to save the Avengers, which changes his approach to being a superhero.
In this fanfiction, it's possible that a symbiote - influenced villain could be the antagonist. Maybe someone who has bonded with a part of the symbiote and has a thirst for chaos. They might see Flash as an easy target to cause mayhem and draw out Spider - Man. Additionally, the Scorpion could be another antagonist. He might be hired by some shadowy figure to capture Flash in order to lure Spider - Man into a trap. There could also be a group of alien invaders who mistake Flash for someone important and Peter has to save him from their clutches.
Well, Mary Jane might be in it. She could be in danger at some point, which gives Peter an extra motivation to save the city. And of course, there could be some new characters created just for this fanfiction, like a young inventor who teams up with Peter to defeat the bad guys. There might also be some villains from the Spider - Man universe, like the Green Goblin or Doctor Octopus.
The plot could twist when it turns out that the real danger the Avengers are in was set up by someone close to Peter. It could be a friend or a teacher who has been secretly working for a super - villain. Peter has to overcome the shock of this discovery and still find a way to save the Avengers.
In some fanfictions, Peter might be captured by an enemy who wants to use his spider - powers for evil. Wade discovers this and embarks on a rescue mission. Along the way, he might team up with some of Peter's friends or allies, like MJ or Ned. The story could also involve Wade having to face some of his own inner demons while trying to save Peter. For instance, his past experiences might make him hesitant at certain points, but his determination to save Peter overcomes those hesitations. And of course, there would be some great action scenes and witty dialogue between the characters.
In some plotlines, it could be that Bella has made a deal with Peter in order to escape Edward's over - possessive nature. Peter might have his own reasons for wanting to get involved, like a long - standing feud with Edward's family. So, he uses his wits and resources to whisk Bella away to a place where Edward can't find her. This could lead to a whole new adventure for Bella as she adjusts to life away from Edward and with Peter's protection.
Another aspect to consider is the context of the story. Is it set in a particular fictional universe that we know? If so, that will shape the events. For instance, if it's in a vampire - werewolf world like Twilight (assuming Bella is from that universe), Peter might be saving her from a vampire attack or something related to the complex politics of that world. The fanfiction could also deviate from the original source material in many ways, creating a unique story around Peter saving Bella.