Yes, there are quite a few. Some explore Peter's unique abilities inherited from Venom. For example, in one fanfiction, Peter has enhanced strength and a strange connection to the symbiote world.
One common theme is identity crisis. Peter has to come to terms with being related to Venom, which is quite different from his normal self - image as just Spider - Man.
Mary Jane could be a great addition. She could be the one who helps Peter deal with the emotional turmoil of having Venom as part of him. Another good character is Ned. He could be the tech - support, trying to find ways to control or enhance Venom's powers. And of course, there's Doctor Octopus. He could be a great villain in the fanfiction, either trying to steal Venom's powers or team up with it against Peter.
Well, in certain fanfictions, Peter Parker's parents could have unknowingly left behind some clues or technology that later played a role in the Venom story. Their work might have been misappropriated by some shady characters who then used it to develop or control the Venom symbiote. It could also be that the symbiote was originally an experiment that was supposed to help protect the Parkers or their work, but it went wrong and became the menacing Venom we know. And the symbiote might have some sort of genetic memory related to Peter's parents that drives its actions when it encounters Peter.
At first, it would be really rocky. Peter would be very wary of Venom given their past encounters. But as Venom shows his more caring side in the adoption, Peter would start to trust him a bit. They'd have to learn to communicate, which would be difficult because of Venom's different way of thinking.
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.
Yes, there are quite a few. You can start by looking on fanfiction.net or Archive of Our Own. There are many talented writers who explore the concept of Peter Parker being Venom in different ways. Some might focus on how he copes with the new powers and the dark side of Venom, while others could be more about the unique adventures he has as Venom - Peter Parker.
In some versions, he might stumble upon the symbiote in a hidden lab where it was being studied. Maybe some scientists were trying to weaponize it and Peter, through his spider - sense, detects its presence and manages to bond with it again.
Another way Peter could become Venom in fanfiction is through a magical or mystical event. Maybe there's a spell gone wrong that links Peter to the Venom symbiote. This would give the story a different kind of feel, with Peter having to deal not only with the physical changes but also the magical implications. He might seek help from Doctor Strange or other magic - using characters in the Marvel universe to understand and control his new state.
One great peter parker venom fanfiction is 'The Bond of Symbiote and Spider'. In this story, it explores how Peter Parker initially struggles with the new power and presence of the Venom symbiote. It shows his moral dilemmas as the symbiote tries to influence his actions, making for a really engaging read.