It might make Ron more protective of Hermione. Just seeing the physical mark of something she has endured could trigger his instinct to keep her safe. For example, he might start to be more cautious when they are on adventures together.
It might change the dynamic. He could start treating her more gently, which could either make Hermione feel a bit odd at first but then grow to appreciate it, or it could annoy her if she doesn't want to be coddled. Either way, it's bound to shift their friendship in some way.
In fanfic, this could symbolize the start of a new arc in their relationship. The scar could be something that draws Ron closer to Hermione on an emotional level. It could also be used to contrast with how Ron has always seen Hermione as this strong, almost unbreakable character, and now he sees her in a more complex way.
Well, at first, it could be a bit of a shock for both of them and they might have some arguments about how it happened and what to do next. But as time goes on, they'd start to really bond over the idea of becoming parents. Ron would probably step up and be more responsible, and Hermione would see a new side of him. They'd have to support each other through the physical and emotional changes of pregnancy. And their relationship would no longer just be about their romantic feelings for each other, but also about building a family together. This would bring a whole new dimension to their relationship, with more love, but also more responsibilities and things to worry about.
They would become more protective of each other. Ron would be more vigilant about Hermione's well - being as she is now the mother of their child. And Hermione would be more understanding of Ron's insecurities as a new father.
Well, it depends on how the writer wants to take it. If it's a more angsty fanfic, their relationship could be on the rocks for a long time. Ron's outburst might make Hermione question their friendship. But if it's a more light - hearted fanfic, they could quickly make up. For instance, Ron could accidentally trip over his own feet while trying to apologize to Hermione, which would make her laugh and forgive him right away. Their relationship could then continue with a bit more self - awareness on Ron's part about his temper.
If Hermione was Harry's sister, the relationship between her and Harry would be more family - oriented. Ron might initially be a bit jealous as he has to share his two best friends in a different way. But overall, they could form a really strong trio with a new family - like bond.
Their relationship could become stronger. They've been through so much together during the war, and now they can fully focus on each other. They might start to understand each other's little quirks even better and have more patience with one another.
At the Yule Ball, the beautiful setting and the music could create a very intimate environment for Harry and Hermione. They may start to realize that they have feelings for each other that go beyond friendship. For example, they might find themselves getting jealous when the other dances with someone else. This jealousy could lead to them confessing their true feelings, which would completely change their relationship from just friends to something more romantic.
There could be a break in their friendship. Ron might realize he made a mistake, but Hermione might not be so quick to forgive. It could take a long time for them to get back to the way they were, if they ever do. They might have to go through a lot of awkward moments and difficult conversations.
The relationship could take a very different turn. Ron might become extremely jealous, especially if he has feelings for Hermione. This jealousy could lead to him lashing out at Hermione and even trying to drive a wedge between her and Draco. Hermione, in turn, might be frustrated with Ron's immaturity and start to distance herself from him. But if they are able to communicate effectively and Ron realizes his jealousy is unfounded, they could start to rebuild their relationship on a more mature and understanding basis.