Yes, there might be such fanfiction out there in the vast world of fan - created works. However, this kind of story often takes a rather unorthodox and perhaps controversial approach to the characters. Fanfiction can cover a wide range of themes and interpretations, but this one is likely to be quite different from the typical Harry Potter stories we know.
One reason could be for shock value. Writers might want to create something that stands out and grabs the attention of readers in a very different way. Another reason could be to explore a unique power dynamic between the two characters. Maybe the writer wants to show a different side of their relationship, like Sirius being in a more authoritative position over Harry in an extreme way.
There might be some out there in the vast world of fanfiction, but it's not a common or well - known type. Most Harry Potter fanfiction tends to focus on more positive relationships, like Harry's friendships, his adventures against Voldemort, or exploring the backstories of other characters. This kind of scenario you mentioned is rather unorthodox and might not be as popular or easily found.
There may be such fanfiction in some niche corners of the internet, but this goes against the original nature of the Harry Potter series and is also a rather strange and inappropriate concept. J.K. Rowling's original works don't have any such plotlines, and most official and mainstream interpretations stay true to the original characters' relationships and story arcs.
It's possible. In the realm of fanfiction, the imagination knows no bounds. Writers might come up with such a scenario for various reasons, perhaps to explore a different side of the characters' relationships. But it's not a common or mainstream concept within the Harry Potter fanfiction community, as it goes against the typical character dynamics we expect from the series.
No. This type of fanfiction contains rather mature and potentially uncomfortable themes for some. It's not suitable for younger audiences who are used to the more family - friendly and positive aspects of the Harry Potter series. The idea of spanking as a form of discipline is a very adult - like concept that might be disturbing or inappropriate for those who expect the typical magic and adventure from Harry Potter related content.
In such a fanfiction, perhaps Harry discovers some new evidence that was overlooked. He might find a witness who was too afraid to come forward before. Then he presents this evidence to the Ministry, forcing them to give Sirius a trial.
The 'Harry Potter' books are set in a magical world full of its own stories, prophecies, and secrets. Sirius is a complex character with a lot on his plate. He has to deal with his family history, his time in Azkaban, and his loyalty to his friends. Fanfiction is a form of creative writing by fans outside the original story. Sirius doesn't have the time or the inclination within the context of the story to be reading fanfiction. His life is too filled with real magical drama and danger.
Maybe Sirius gets help from some powerful wizards or witches who believe in his innocence. They might testify on his behalf in front of the wizarding authorities. Sirius also could show his strong emotional bond with Harry. He has always been there for Harry in spirit, and now he can be there physically to raise him, which convinces the authorities to give him custody.
It's a rather strange and inappropriate idea. Harry and Snape have a complex relationship in the original series, and this concept distorts that relationship in an unseemly way. Fanfiction should enhance the world of the original work, not introduce such out - of - place and improper scenarios.