Perhaps Snape discovers a time - turning spell. He decides to go back in time to save Lily. When he does, it changes the future. Harry now grows up with his mother, and Hermione is intrigued by this new version of history. Snape has to deal with the consequences of his actions, like how it affects the wizarding world's balance. Lily tries to adjust to this new life and also helps Hermione study some long - lost magic that was forgotten due to the change in time.
One idea could be that in an alternate universe, Snape manages to save Lily and they both play a big role in Harry's upbringing along with Hermione. Maybe Snape uses his potions expertise and Lily's charm work to create a special protection spell for Harry that Hermione later helps to understand and strengthen. Another plot could be that Lily didn't die but was in hiding, and when Harry enters Hogwarts, Snape has to reconcile his feelings for Lily with his role as a teacher to Harry, while Hermione gets caught in the middle trying to figure out the truth behind their complex relationships.
One idea could be that Harry discovers the truth about his parentage early on. This changes his relationship with Dumbledore as he realizes Dumbledore had been keeping this big secret from him. He might also struggle with his identity, feeling torn between the Gryffindor ideals he was raised with and the Slytherin traits he might inherit from Snape.
One idea could be a story that delves into their early years at Hogwarts. Maybe show more of their interactions outside of what we saw in the original books, like how they might have studied together in the library and the little secrets they shared. Another plot could be a what - if scenario where Snape made different choices regarding Lily and how that would have affected their relationship. For example, if he had been more open about his feelings earlier.
One plot idea could be that Snape takes Hermione under his wing after he discovers her extraordinary magical potential at a young age. He secretly trains her in advanced potions and dark arts defense, much to the surprise of the other Hogwarts faculty. Another could be that Hermione's parents die unexpectedly, and Snape, having a soft spot for her intelligence, steps in as a guardian. He helps her navigate the complex wizarding world politics while she tries to uphold her muggle - born values.
One plot idea could be that during detention, Snape discovers Hermione's hidden talent for potion-making that even he hadn't expected. He starts to see her in a new light, not just as an over - achieving Gryffindor. Another idea is that they get trapped in the detention room due to a spell gone wrong, and they have to work together to get out, which leads to a grudging respect between them. And perhaps Hermione finds an old diary in the detention room that has some secrets about Snape's past, which she uses to understand him better.
There are fanfictions that explore the idea of a parallel universe where Snape and Lily got together. In this universe, Harry and Hermione could have different roles. Maybe Harry grows up in a more stable family environment with Snape as a father - like figure, and Hermione is there to study this unique family dynamic and how it affects the wizarding world.
Another plot could be that Hermione gets transported back in time and ends up as a student when Snape was still at school. She sees a different side of him, not just the strict professor she knew. They might team up to deal with some dark magic threats in the school at that time. Snape could initially be suspicious of her but then realize she has valuable knowledge from the future.
A possible plot is that she has a special gift for potion - making, like Snape, but also a love for books and knowledge like Hermione. This leads her to create new potions based on old, forgotten spells she discovers in the library. However, there are those who are jealous of her abilities and try to stop her progress.
A third plot idea is that Hermione accidentally stumbles upon a spell that links her mind with Snape's. Through this connection, she experiences his memories and emotions. This allows her to see his side of the story, especially his unrequited love for her mother - like figure, Lily. As she delves deeper into his mind, she starts to change her view of him completely and tries to help him find some peace in his tortured existence.
Well, a plot could be that there is a mystery in Hogwarts that only Snape and Hermione seem to notice. They start investigating together, initially distrusting each other. As they dig deeper, they find that it is related to a long - forgotten potion recipe. Along the way, they have to face challenges like avoiding other teachers' suspicions and dealing with some magical creatures that are guarding parts of the mystery. Another interesting plot could be that Snape and Hermione are magically linked in some way, perhaps due to a spell gone wrong. They start experiencing each other's emotions and memories, which forces them to understand each other on a much deeper level. This could lead to a whole new relationship between them, different from the typical student - teacher dynamic.
One idea could be that Snape discovers Hermione has a rare magical ability that he's secretly been researching. He takes her on as an apprentice of sorts, much to the surprise of everyone. This could lead to a series of adventures where they explore the depths of this magic together and Snape slowly starts to see Hermione in a new light.