Well, in these fanfictions, a plot twist could be that the force behind Snape having to protect Hermione is actually a spell or a curse that has unforeseen consequences. For instance, as he protects her, he starts to lose his own memories related to a certain dark magic. Another common plot twist is that Hermione turns out to be the only one who can break a dark spell that is affecting Snape, so his protection of her becomes a matter of self - preservation as well. And there could be a plot twist where Snape discovers that Hermione has a secret identity or power that makes her a target for not only the dark forces but also some unexpected allies, which completely changes the dynamic of his protection.
A great plot twist could be that younger Snape actually has some knowledge of Hermione's time - traveling. Maybe he's been having strange dreams about the future and when he meets Hermione, he realizes she's part of it. This would completely change the power dynamic between them.
Well, in some fanfictions, their relationship starts off very rocky. Snape is reluctant at first because of his past grudges. But as he is forced to protect Hermione, he gradually sees her intelligence and bravery. He might start to respect her more and they could develop a sort of begrudging alliance. As time goes on, this could turn into a more complex relationship where they actually start to care for each other in a way neither expected.
One plot twist could be that Snape is actually under a spell that makes him fall in love with Hermione. This could lead to a whole mystery about who cast the spell and why. Hermione would then have to figure out whether the love is real or not, while still dealing with the feelings she has developed for Snape. Another could be that they get married in secret, and when it's revealed, it causes an uproar in the wizarding community, with people taking sides either for or against their union.
Well, one possible scenario could be that in the fanfiction world, there are dark wizards or forces targeting Hermione for her knowledge or power. Snape, with his skills and knowledge of the dark arts, could use his magic to shield her from attacks. For example, he could set up protective spells around her when she is studying in the library or traveling around Hogwarts.
One popular plot twist could be that Snape is actually controlling Hermione to protect her from a greater danger that she's unaware of. Maybe there's a dark wizard targeting her and Snape's control is a way to keep her out of harm's way while he figures out how to defeat the threat.
One possible plot twist could be that Hermione discovers a hidden prophecy that only she can fulfill to save Snape. This prophecy might be related to some ancient magic that Snape has unknowingly become a part of. Another twist could be that in order to save Snape, Hermione has to team up with some of her former enemies, like Draco Malfoy, who also has a vested interest in Snape's survival for some reason. And perhaps the most unexpected twist could be that Snape's salvation is somehow linked to Hermione's ability to time - travel, which she uses to go back and change certain events that led to Snape's peril in the first place.
A really interesting plot twist could be that Snape was under a spell all along that made him seem so cold and distant, and Hermione discovers it. This changes the whole dynamic between them. Another twist could be that Hermione is actually related to someone from Snape's past in a way that they never expected, which brings them closer.
One interesting plot twist could be that Snape, despite his initially cold exterior, uses his advanced potions knowledge to secretly develop a cure for Hermione's head trauma. This would add a layer of complexity to his character as it shows a more benevolent side.
One common plot twist is when Lily discovers Snape's deeper involvement with the Dark Arts later than expected. This realization makes her lash out at him more harshly than before, causing great pain. For instance, she might find out about some of his secret experiments or associations.
While there might be some out - of - character and inappropriate fanfictions with this plot, it's important to note that J.K. Rowling's original works do not contain any such elements. Snape has his own story arc related to his love for Lily and his role in the wizarding war, not this kind of immoral behavior.