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.
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.
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.
One idea could be that Severus discovers Hermione has a unique magical ability that only he can help her control, and in the process, he starts to see her as more than just a student. Another could be that Hermione is turned into a small, magical creature by accident, and Severus takes her in as a pet to protect her until she can be turned back. And perhaps, Severus initially resents having to take care of her but gradually grows fond of her presence.
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.
One plot idea could be Hermione and Severus initially hating the idea of the arranged marriage. Hermione might try to find a way out while Severus is conflicted between his past prejudices and the new situation. As they are forced to spend time together, they gradually discover each other's hidden depths. For example, Hermione realizes Severus's great knowledge of the Dark Arts which he can use to protect her in a dangerous situation, and Severus comes to respect Hermione's intelligence and courage.
A plot could revolve around a magical artifact that bonds Hermione and Fred together in a way that they have to take care of a baby created by the artifact's magic. As they take care of the baby, they start to fall in love with each other in a way they hadn't before. The story could be about their journey of self - discovery and new - found love while dealing with the baby.