The snake bites girl story might involve a girl who lives in an area where snakes are common. One day, while she was doing her daily chores, like fetching water from a nearby stream, a snake hiding in the grass bit her. This could lead to a series of events such as her trying to get help, dealing with the pain and the fear of the snake's venom.
I'm not really sure specifically as it could be a rather unique or less - known visual novel. It might involve some sort of strange or dark theme given the 'maggot bites' part, but without more information, it's hard to say exactly.
In 'Eighth Grade Bites', a significant theme is the struggle for acceptance. The main character is likely trying to fit in both in the normal social world of eighth grade and in the new world of the bites or supernatural elements. Friendship is also a big theme. How the character's relationships with friends are affected by these new developments. And there's probably a theme of self - discovery, as they learn more about their own capabilities and limitations in this different reality.
In other stories, the main character might be a detective or a scientist. For example, a scientist who is studying a new species of venomous snake. He gets bitten during his research and then has to fight against the venom that is slowly taking over his body while also trying to figure out how to stop the snake from attacking more people. He becomes the central figure as he battles his own impending doom.
One 'bites scary story' could be about a strange bite mark on a person's neck that keeps getting deeper and more painful every night. They start having nightmares of a shadowy figure approaching them and then feeling a searing pain on their neck. It turns out to be a vampire - like creature from an old curse.
Often, the theme of hidden emotions is present. Snape has a very complex relationship with Harry in the original series, and the biting in fanfiction can be a way to expose the unspoken and intense feelings he has for Harry. It could be a form of extreme jealousy, protectiveness or even a twisted form of love. There's also the theme of transformation. The bite might change Harry in some way, either physically or in his perception of Snape and the wizarding world around him.
One popular 'Edward bites Jacob' fanfiction might be 'The Unlikely Encounter'. In this story, the bite could be a turning point in their relationship, leading to unexpected alliances and a whole new set of adventures. It might explore how Jacob copes with the new situation and how Edward deals with the consequences of his action.