One idea could be that Hermione accidentally travels too far back in time with the Time - Turner and ends up in Severus' student days. She has to navigate Hogwarts without being detected while also trying to figure out how to get back. And Severus stumbles upon her and at first is suspicious but then realizes she's from the future and they start to work together to fix the time - line.
Another plot could be that Hermione uses the Time - Turner to go back in time to try and prevent Severus from making some of the more tragic decisions in his life. But when she gets there, she realizes that changing things isn't as easy as she thought. Severus is initially resistant to her interference, but gradually sees that she might be able to help him in ways he didn't expect.
One idea could be Snape using the Time - Turner to go back and change a crucial moment in his relationship with Lily. Maybe he tries to prevent her from getting involved with James Potter. Another plot could involve Snape using it to gain an edge in his spying for Dumbledore during the First Wizarding War. He could go back in time to gather more information about Voldemort's early plans.
One idea could be that Hermione, using the Time - Turner, accidentally goes back to a time when Lucius was a young Death Eater in training. She tries to subtly change his path, which leads to a series of events where they form an unlikely alliance. They might start to understand each other's motives and values more deeply.
Maybe a plot where the Time Turner malfunctions and sends a character into an alternate timeline within the fanfiction's universe. This would lead to them having to figure out how to get back while also dealing with the differences in this new timeline, like different relationships between characters or altered magical laws.
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 Hermione discovers she has a long - lost family connection to Severus. Maybe they are distantly related through some ancient magic lineage. This could lead to them having to work together to protect their family's magical secrets from dark forces.
One idea could be that Severus and Hermione have to protect their baby from dark forces. Maybe there are some old enemies of Severus who target the baby to get revenge. Another plot could be the baby having some unique magical abilities that they need to figure out how to handle and train.
Perhaps the story could focus on the child's struggle with the fact that their parents were from two very different Hogwarts houses. Hermione from Gryffindor and Severus from Slytherin. This could lead to the child having an identity crisis and trying to find their place in the wizarding community, both among their peers and in the context of the long - standing house rivalries.
Well, a plot could involve Severus using his potions expertise to ensure a healthy pregnancy for Hermione. Since they come from different backgrounds, there could be a cultural clash within the wizarding society regarding their relationship and the pregnancy. And perhaps the baby has some unique magical abilities that start to show even before it's born, which attracts the attention of both good and bad wizards.
One idea could be a time - travel plot where Hermione goes back in time and has to work with a younger Severus Snape. They could team up to prevent a dark wizard from rising earlier than in the original timeline. This would put them in a situation where they have to trust each other despite their differences in age and temperament.
One idea could be that Severus discovers Hermione is in danger from some dark magic users due to her intelligence and Muggle - born status. He takes it upon himself to protect her like a father would. For example, he could secretly follow her around Hogwarts, using his skills in potions and the Dark Arts to thwart any threats.