In some fanfictions, the plot could revolve around Snape teaching Harry about the Dark Arts in a way that Dumbledore never would. Harry might become more proficient in defensive spells against the Dark Arts but also be more exposed to the darker side of magic. This could create a moral dilemma for Harry as he grows up. Additionally, the relationship between Harry and Draco Malfoy could be completely different, as Snape's influence on Harry might make him less likely to be enemies with Draco from the start.
One popular fanfiction with this concept might be 'The Unthinkable' (this is just an example, not an actual well - known title with this exact plot). In many such fanfictions, it explores how Snape's personality would influence Harry's upbringing. Snape, being strict yet intelligent, could instill in Harry a different set of values compared to the Dursleys or even Dumbledore's influence in the original series.
Another reason might be that Harry is suspected of sneaking around in areas where he's not supposed to be. Snape, as a vigilant teacher, may punish Harry to maintain discipline in the school. He may think Harry is up to something related to the ongoing dangerous situations in the wizarding world and wants to keep him in line.
One popular Snape - Harry fanfic with the concept of Snape knots could be 'The Unraveling of Snape's Knots'. In this fic, it might explore the complex relationship between Snape and Harry through the metaphor of knots, perhaps representing the tangled emotions and secrets between them.
There are fanfics where Snape and Harry team up to solve a mystery that was hidden in Hogwarts long before Harry arrived. It gives a chance to see their different skills and personalities working together towards a common goal. Another concept is Snape and Harry having a time - travel adventure where they have to correct mistakes in the past to save the future of the wizarding world. This allows for a lot of character development and exploration of their relationship in different time periods.
Well, perhaps there was an emergency at Hogwarts. Maybe some dark forces were approaching, and Snape, being a powerful wizard and a Hogwarts professor, felt it was his responsibility to pick Harry up. Harry was always a target for the dark side. Also, it could be that Snape had some new information about Harry's family or his destiny that made him decide to take Harry under his wing, so to speak, by picking him up.
One example could be that Snape secretly helps Harry with his Potions work. He might leave some useful hints or books where Harry can find them. Maybe he gives Harry a potion ingredient that is hard to get when he sees Harry struggling to complete a difficult potion recipe.
Well, usually they focus on the relationship between Harry and Snape in a more positive and heart - warming way. Instead of the typical animosity, they show how they can get along or even care for each other. For example, Snape might secretly protect Harry in ways that are revealed in a cute manner.