Sometimes, they get injured accidentally, like in a potions accident gone wrong in the Hogwarts dungeons. This then leads to a series of events where they learn more about each other's vulnerabilities and strengths. It can also bring out the protective sides of their friends, like Harry trying everything he can to make sure they are okay.
One common plotline could be Hermione forming a closer friendship with Fleur. Since she hates Ron, she might turn to Fleur for support and they could end up having adventures together, perhaps in the wizarding world outside of Hogwarts.
There's often the sacrifice plotline. They might sacrifice their relationship with Hermione to save a large number of people. For instance, they learn that a dark wizard will spare many lives if they abandon Hermione. Also, the jealousy plotline can exist. If a new character becomes closer to Hermione and they feel left out, they might leave out of jealousy and a sense of not belonging in Hermione's new social circle.
A common plotline is Hermione getting injured during a battle or a dangerous adventure. For example, in many fanfics, she might be hurt while exploring an old, dark wizard's lair. Another is getting injured by a magical experiment gone wrong, like in some stories where she's trying a new, untested spell.
One possible plotline could be a situation where Hermione loses her bra during an adventure with Ron and there's some comical or awkward moments as they try to deal with it without others noticing. Another could be that Ron accidentally sees Hermione's bra and it causes some blushing and confusion between them as they realize their growing feelings for each other in a new light.
Ron would be devastated. He might initially be at a loss for what to do. But then his Gryffindor courage would kick in. He'd start researching every possible cure or treatment for her injuries. He'd be the one to comfort Harry and the others while also being the most vocal in demanding justice for Hermione. His relationship with Hermione, whether you see it as just friends or something more, would make him act in a very passionate and protective way.
A plotline where they form a secret club at Hogwarts. They have to keep it a secret from the teachers and other students while they work on a special project. It could be something like creating a new spell or trying to communicate with a magical creature that has never been done before. Their different personalities would lead to both funny and tense situations within the club.
Well, one plotline could be that Hermione is heartbroken by Ron's cheating. Draco, who has secretly admired her from afar, steps in to comfort her. This leads to them exploring a relationship that was previously unthinkable due to their houses' rivalry.
One interesting plotline could be that after a long time apart, Ron and Hermione reunite during a dangerous mission. They realize that their feelings for each other are still as strong as ever, and they have to work together to overcome the challenges in the mission while also rekindling their relationship. Another plotline might be that they reunite at a Hogwarts reunion. There, they see how much they've both changed yet how their connection remains deep. They then start to share all the things that have happened to them in the years since they last saw each other.
A common plotline is where they decide to explore the Muggle world together. Ron is always curious about Hermione's Muggle - born background. They get into all sorts of comical situations as Ron tries to understand things like cars and telephones. And of course, their love for each other grows even deeper during this exploration as they see new sides of each other that they hadn't before.
A very interesting plotline is when their children have to face a new dark force in the wizarding world. This forces them to rely on the skills and values taught by Ron and Hermione. The story might also include how they use their parents' old friends and resources to combat this threat, while also growing as individuals in their own right.