Severus might be developed as a more complex and empathetic character. By saving Hermione from Ron, he shows a side of himself that is protective and caring, which is different from his usual cold exterior. This could be a turning point in how the other characters view him.
Another way Severus could save Hermione is by using his knowledge of the Dark Arts in a positive way. If she was hurt by a Dark spell from Ron (in the context of the fanfic), Severus might be able to counteract the spell's effects. He has extensive experience with Dark Arts spells, so he could figure out what spell Ron used and then use a counter - spell to reverse the damage.
One possible plot could be that Ron is under the influence of a dark spell that makes him act aggressively towards Hermione. Severus, being observant, notices this and steps in to protect Hermione. He uses his potions knowledge to create an antidote for the spell on Ron.
There might be some kind of misunderstanding. For example, Ron could have been misinformed about Hermione's actions. He thought she betrayed him in some way, like sharing Gryffindor's secrets with Slytherins, so he lashes out at her.
Severus might start off as just fulfilling a sense of duty. He has always been a complex character. But as he saves Harry from the Dursleys, he begins to see Harry in a new light. He realizes that Harry is not just James Potter's son but an individual with his own struggles. This could lead to him becoming more empathetic towards Harry, gradually shedding some of his cold exterior.
For Hermione, in fanfic she might be more daring than in canon. She could be more willing to take risks without thinking too much about the rules, especially when it comes to her relationship with Scorpius and Severus. Scorpius, who is often seen as a bit of an outsider in the official stories, could be developed into a more confident character, perhaps even leading the group at times. Severus, instead of his usual brooding self, could be more open and less bitter, sharing his knowledge more freely.
In the fan fiction, Severus could start to develop a sense of responsibility towards Harry. At first, he may have saved Harry out of a sense of duty to Lily Potter, but as time goes on, he realizes that Harry has his own worth. This could make him more open to forming a bond with Harry, which is a huge change for his character who has been so closed - off for so long. He may also start to question some of his long - held beliefs about the Gryffindors, especially as he sees Harry's courage in the face of his difficult upbringing at the Dursleys.
One possible reason Severus might protect Hermione from Ron in fanfiction could be that Severus sees Hermione's potential and intelligence, which he respects. He may not want Ron's sometimes hot - headed or jealous nature to harm Hermione. In many fanfictions, Severus is often portrayed as a complex character who might step in to safeguard Hermione, perhaps out of his own sense of justice or an unspoken admiration for her.
Well, in fanfiction, anything can happen. Hermione leaving Ron for Severus might be a way for writers to show Severus in a different light. Perhaps they see Severus as someone who has been misunderstood and Hermione, being the intelligent and perceptive character she is, could be the one to recognize his true worth. But it also shakes up the core relationships we knew from the original series, which can make some fans uncomfortable.
A more complex plot development might involve the origin of the snake. It could be a dark wizard's pet that was set loose deliberately to target Severus. After Hermione saves him, they could team up to find out who was behind it. This would lead them on a journey where they have to use both of their skills. Hermione's book - knowledge and Severus' experience in the dark arts. Along the way, they might discover secrets about each other and their families that were previously unknown, which could further deepen their relationship, whether it becomes a friendship or something more ambiguous.
It should start with mutual respect for each other's intelligence. Snape respects Hermione's academic achievements and Hermione respects Snape's vast knowledge of magic. Then, they could be thrown into a situation where they have to rely on each other, like a dangerous magical experiment gone wrong.