A possible origin story could be that he entered a parallel dimension where vampirism and his spider - powers co - exist. When he returned to his own dimension, he retained some of the vampiric traits, like the fangs. This would open up the story to exploring different dimensions and how they can affect a character's powers and appearance.
Perhaps in the fanfiction, Peter Parker was exposed to a magical artifact that cursed him with vampiric features, such as fangs. Or, it could be that he made a deal with a dark entity in order to gain more power to fight his enemies, and part of the deal was getting fangs. This would add a moral dilemma to his character as he has to deal with the consequences of this deal.
One possible theme is the fragility of life. Despite Peter's powers, his death in fanfiction can show that no one is invincible. It can also explore themes of redemption for other characters. For example, a villain might have a change of heart after Peter's death. There could also be a theme of hope emerging from the ashes of his death, with new heroes rising up.
If such a fanfiction exists, it could be a very dark interpretation. Maybe it's part of a scenario where Peter is in a fight with a villain who has overpowered him and is trying to kill him in this brutal way. Or it could be a non - villain - related situation, like an accident or a misdirected power use by another character, but this is still a very disturbing concept.
One possible plotline could be Peter struggling to communicate his superhero identity and his daily life challenges to his friends and family without using his voice. Maybe he has to develop a unique sign language or other non - verbal communication methods.
In fanfiction, Peter Parker might be able to lift Mjolnir if the writer decides to tweak the rules a bit. Maybe it's because of his pure heart, similar to Captain America. His sense of responsibility and selflessness could be seen as worthy in the context of the fan - created scenario.
In fanfiction, Peter Parker having fangs could completely transform his abilities. He might gain the power of venom injection through his fangs. This could be used to paralyze his enemies. His agility could also be affected, as he might move more like a predatory animal. Additionally, his diet might change, which could lead to new storylines about how he manages his new dietary needs while still being a hero.
In this fanfiction, perhaps Peter Parker is a huge dragon fan from a young age. One day, he somehow gets transported to a world full of dragons. There, he uses his intelligence and Spider - Man - like skills to survive. He might learn how to communicate with the dragons and ends up befriending one. This dragon could then help him get back to his own world, but not before he has to face some challenges in the dragon world, like saving the dragon eggs from poachers.
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, one reason could be that he's on a secret mission for S.H.I.E.L.D. that requires him to go undercover and cut off all contact. Maybe he's investigating a new super - villain threat that's too dangerous to let anyone know about.
He might think it's not in line with the real Steve. Fanfiction can be quite far - fetched sometimes.
One possible storyline could be exploring the emotional turmoil Peter goes through due to the abuse. He might struggle with his sense of self - worth and his relationship with other superheroes. Another could be his journey to overcome the trauma and find a way to heal, perhaps with the help of his friends like Ned or MJ.