A great plotline could be Hermione and Ron going on a magical journey to find a special charm or ingredient that is said to ensure the baby has a strong magical ability. It could be a dangerous quest that tests their relationship and their skills as wizards.
Another plotline might be that Hermione discovers she has a rare magical condition during her pregnancy that only a few wizards in history have had. Ron has to search far and wide for a cure while also dealing with his own fears and insecurities about becoming a father.
One more interesting plotline could be that their pregnancy is a result of a magical prophecy. This prophecy not only predicts the birth of their child but also the great things the child will do in the wizarding world. As a result, they are under a lot of pressure from the wizarding community, both good and bad, to ensure the safe arrival of the baby.
Another plot could involve how their friends, like Harry, react to the news. Harry might offer his support and share his own experiences of growing up without parents, vowing to be a great godfather. There could also be a sub - plot about how Hermione's pregnancy affects her studies or research in the magical field.
There are also fanfictions where the news of Hermione and Ron's pregnancy spreads across the wizarding world. Their friends from Hogwarts are excited and plan a big celebration. However, they also face some challenges. For example, there could be some dark wizards who might see this as an opportunity to target them, so they have to take extra precautions to protect their unborn child.
One possible plotline could be Ron misinterpreting innocent interactions between Harry and Hermione as something more. For example, he sees them studying together late at night and jumps to the wrong conclusion. He might start acting cold towards them, which then causes a rift in their friendship trio. As the story progresses, they could all have heart - to - heart conversations to clear up the misunderstandings.
A plotline could involve Ron and Hermione dealing with the stress of impending parenthood while also handling their jobs at the Ministry. Hermione might be worried about taking time off from her important research work, and Ron could be trying to prove that he can be a reliable provider. They could also face some magical mishaps during Hermione's pregnancy, like strange spells affecting the baby's nursery that they have to figure out together.
One possible fanfiction could be where Hermione gets jealous when Ron starts spending a lot of time with a new female student in Hogwarts. She starts acting out in class and Ron doesn't understand why at first. Then, Harry has to step in and make Ron realize that Hermione might be feeling left out. This could lead to a big argument between Ron and Hermione which Harry tries to mediate.
Some fanfictions focus on their adventures in a parallel magical universe. In this universe, the rules of magic are slightly different. For instance, they might find that instead of using wands, magic is channeled through certain crystals. Harry, Ron and Hermione would need to adapt quickly to this new form of magic and also deal with the different threats and mysteries that this parallel universe holds. They might also meet alternate versions of themselves, which could lead to some really interesting character - development moments.
A third plotline could revolve around a magical object or a special power that only Harry seems to have access to. For example, if there was a new magical amulet discovered that has a special connection with Harry. Hermione, being the knowledge - thirsty witch she is, might be jealous that Harry gets to experience and explore the powers of this amulet while she is left out. This could lead to a rift in their friendship until they figure out how to share or include Hermione in the discovery.
One great 'Harry Potter Hermione Ron fanfiction' is 'The Golden Trio's New Adventure'. It takes place right after the war and shows them going on a quest to find a lost magical artifact that could potentially bring back some of the lost magic during the war. Another is 'Hermione's Secret'. In this one, Hermione discovers she has a hidden power and Ron and Harry help her figure out how to control it.
Some fanfictions focus on the relationship between Ron and Hermione. Maybe there's a story where they break up due to a misunderstanding, but then they have to work together on a dangerous mission. During the mission, they realize how much they still love each other and get back together in a very heart - warming way.
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.