Well, if Peter Parker becomes Flash in fanfiction, he might use his new super - speed in really interesting ways. For example, he could swing between buildings as Spider - Man even faster. Maybe he'd combine his spider - sense with the Flash's ability to see things in slow motion, making him an even more formidable hero. He could also use the Flash's speed to create new web - slinging techniques, like using his speed to make the webs shoot out faster and farther.
His spider - sense and the Flash's super - speed could work together amazingly. The spider - sense could warn him of upcoming threats just in time for him to use his speed to avoid them. He could also use his speed to get to the source of the danger that his spider - sense detects more quickly.
One possible scenario in such a fanfiction could be a school - related incident. Flash taunts Peter in front of everyone, and Peter, tired of it, decides to fight back in a more subtle way. Maybe he uses his super speed and reflexes to dodge Flash's attacks and make Flash look foolish without using full - on Spider - Man powers.
In a fanfiction where Peter Parker becomes Venom, it could be due to a scientific experiment gone wrong. Maybe Oscorp was working on a new symbiote project, and Peter, being the curious and heroic type, gets involved accidentally. The transformation would change his personality, making him more aggressive at first as he struggles to control the new power. He might initially see the symbiote as a curse but later learn to use it for good, in a different way than he does with his Spider - powers.
One idea could be that Peter uses his spider - abilities to help on the farm. For example, he can use his super strength to lift heavy farming equipment or his agility to quickly harvest crops. Maybe he becomes a farmer to get away from the chaos of the city and superhero life for a while, finding peace in the simple life of farming.
One possible story could be that in the fanfiction, Flash's bullying of Peter Parker is a way to show his own insecurities. Flash might bully Peter because Peter is intelligent and seems to get more attention from the teachers, making Flash jealous. For example, Flash could constantly make fun of Peter's nerdy appearance and his love for science, but little does he know that Peter is actually Spider - Man.
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, perhaps Flash gets into some sort of trouble like being kidnapped by a group of villains who want to use him as a bait to lure Spider - Man (Peter Parker). Peter, using his spidey - senses, tracks Flash down and has to fight off the bad guys to save him. It could also be that Flash accidentally stumbles upon a dangerous experiment and Peter has to save him from the resulting chaos.
There could be a deeper reason for the fight in the fanfiction. Maybe Flash has accidentally found out something about Peter's double life and is trying to blackmail him. This would lead to a more intense and emotional fight, with Peter having to protect his secret identity at all costs.
His costume could potentially change. He might add some darker elements or more gadgets inspired by Batman. He could also start to use his intelligence in a more detective - like way, setting up surveillance around the city to anticipate crime, rather than just waiting for his spider - sense to tingle. This new - found admiration for Batman could make him a more serious and calculated hero.