One idea could be a story where Minerva and Severus have to team up to protect Hogwarts during a new, unexpected threat. Maybe a dark magic artifact is discovered near the school and they must use their combined knowledge and skills to keep it from falling into the wrong hands.
Another interesting plot could be a story set in an alternate universe where Minerva and Severus are not professors but Aurors. They are assigned to a case together that involves a powerful dark wizard. As they work together, they gradually learn to respect and rely on each other more than they ever thought possible, and their relationship evolves from one of mutual distrust to a deep friendship or something more.
A plot could revolve around their pasts. Perhaps they were both involved in a secret mission during their younger days that was never fully resolved. Now, in the present, events start to unfold that force them to revisit that time and finally put things to right. This could explore their relationship from a new perspective, showing how they interacted before they became the well - known professors at Hogwarts.
Another trope is the 'mentor - mentee' dynamic in reverse. Usually, they are both mentors to students, but in some fanfictions, they end up learning from each other. Snape might learn more about emotional openness from McGonagall, while she could learn about some of the darker arts and how to better protect students from Snape. It's an interesting flip of their usual roles.
One great Severus Snape and Minerva McGonagall fanfiction is 'The Unlikely Alliance'. In this story, they are forced to work together on a Hogwarts project. Their different teaching styles and personalities create interesting interactions. Snape's brooding nature contrasts with McGonagall's more no - nonsense approach, and as they overcome obstacles in the project, they also start to understand each other better on a personal level.
One popular theme is their friendship. Despite their differences, they are both dedicated teachers at Hogwarts, and fanfictions often explore how they might support each other behind the scenes. Another theme is their possible romantic relationships, not necessarily with each other, but how their views on love and relationships might be. For example, Snape's unrequited love for Lily could be contrasted with McGonagall's more reserved approach to love. Also, their roles during the wizarding wars are often explored in fanfictions. How they coped with the danger, made decisions, and protected the students.
How about a story where Hermione discovers a hidden talent for transfiguration that even McGonagall is surprised by. They then work together to perfect this new form of transfiguration, but face opposition from some of the more traditional - minded professors. Or, in a post - war Hogwarts, they collaborate to reform the curriculum to include more practical and modern magic, all while dealing with the after - effects of the war on the students and the school.
One plot idea could be how she manages her pregnancy while still fulfilling her duties at Hogwarts. Maybe she has to keep it a secret at first and enlists the help of a few trusted colleagues like Dumbledore. Another could be exploring her relationship with the father, whether it's a fellow wizard or a Muggle, and how that relationship evolves during the pregnancy.
For Minerva, you could explore her more emotional side. In fanfiction, show her struggling with her feelings for Severus. Maybe she has always seen him as a difficult colleague, but then realizes there is more to him. For Severus, delve deeper into his loyalty. You can write about how his loyalty to Dumbledore and Hogwarts extends to his relationship with Minerva. For example, he would do anything to protect her when Hogwarts is in danger because she is an important part of what he is protecting.
Their different personalities make it interesting. Snape is brooding and often seen as a bit of an outsider, while McGonagall is strict but fair. The contrast between them gives a lot of room for creative writing. For example, how they handle discipline in their respective houses is very different, and fanfictions can explore the clashes or agreements that might occur.
One plot idea could be Severus Snape taking in an orphaned student from Hogwarts and becoming a father figure to them. He could teach the child not only magic but also important life lessons. Another idea is a time - travel plot where an adult character goes back in time and Severus Snape ends up being like a father to them in their new timeline.
Well, we could have a fanfiction where Snape is alone after the war. He's left to pick up the pieces of his life. He decides to go on a journey to find a place where he can truly be at peace. Along the way, he meets some muggles who unknowingly teach him about the simplicity of life. This makes him realize that he doesn't need all the magical trappings to be happy.
One idea could be that Snape takes Malfoy under his wing in a more personal way than just as a student. Maybe he discovers Malfoy's hidden talents in potions that no one else has noticed and helps him develop them further. This could lead to a bond between them that goes against the typical Slytherin hierarchy.