Maybe it's a group of fans who collaborate on writing this fanfiction. They might each bring their own ideas about Hermione and Professor McGonagall, and combine them to create this story where Hermione screams. There are so many possibilities in the world of fanfiction writing.
Perhaps there was some kind of magical accident or strange phenomenon that involved Professor McGonagall. Hermione, being the curious and sometimes easily startled girl, might scream in shock when witnessing it.
I'm not sure if there is such a fanfiction that is completely appropriate for all ages as the concept of spanking can be a bit controversial and not in line with the positive educational relationships usually depicted in the original 'Harry Potter' series. However, the fanfiction world is vast, and some might try to handle it in a more light - hearted or non - inappropriate way, but it's hard to say for sure.
Well, it could be a comical misunderstanding. Maybe Hermione accidentally breaks a very important magical item in McGonagall's classroom while trying out a new spell. McGonagall, being strict but fair, gives her a light 'spanking' with a magical object that just makes a slapping sound but doesn't actually hurt, as a form of light - hearted punishment and to teach her to be more careful.
There's also 'Minerva's Legacy'. This one focuses on McGonagall's influence on the students, especially the female students. It shows how she encourages them to break boundaries in a world dominated by male wizards. The way it portrays her as a role model is really inspiring.
Well, initially McGonagall adopts Hermione out of a sense of duty and seeing Hermione's need for a more stable environment. In the beginning, Hermione is a bit in awe of McGonagall. But as they live together, they start to have small moments of connection. For example, over a shared cup of tea while discussing a difficult spell. Slowly, they start to understand each other's quirks. McGonagall learns about Hermione's passion for knowledge and Hermione discovers McGonagall's softer side. Their relationship blossoms into a beautiful and deep bond that affects both of their lives positively at Hogwarts and beyond.
There are probably fanfictions out there with this premise. Fanfic authors love to play with the established canon of a story. By making Minerva McGonagall Hermione's mother, they can rewrite many aspects of Hermione's life. Maybe she would have grown up with a different set of values, or her magical abilities could be seen in a new light. It also has the potential to create new conflicts and reconciliations within the Hogwarts community.
One great fanfiction could be 'The Trio's Guidance'. In this fic, Dumbledore, McGonagall, and Hermione work together to solve a mystery within Hogwarts. It beautifully weaves their different personalities together. Hermione's intelligence, McGonagall's strict yet fair nature, and Dumbledore's wisdom all play important roles in the story.
Perhaps Hermione is facing some sort of interpersonal issue. She could have had an argument with her friends, like Ron and Harry. In the wizarding world, friendships are crucial. If there's a rift in their relationship, it would deeply affect Hermione. McGonagall, being a perceptive teacher, might then try to mediate and give Hermione advice on how to handle the situation.
Another reason is that the 'Harry Potter' universe is so vast. There are so many possibilities for stories centered around her. Fans love to imagine different scenarios where McGonagall is involved. It could be her taking part in a secret mission, or her having a different relationship with the Death Eaters. There's just so much room for creativity when it comes to writing about her.