A possible plot is that they are in bed and start arguing about a minor thing like who left their wand on the wrong side of the bedside table. But then it turns into a playful banter and then a passionate moment as they realize how silly the argument was. Another idea is that they are in bed getting ready to go to sleep and they start talking about their families. Hermione tells Ron about her Muggle parents and how she misses them sometimes, and Ron shares stories about his large family at the Burrow. This conversation deepens their bond as they fall asleep in each other's arms.
In the fanfiction, after the kiss in the tent, they could face some internal struggles. Ron might be worried about not being good enough for Hermione, who is so brilliant. Hermione, on the other hand, could be concerned about how their relationship will affect the group dynamic. They then have to work through these issues, with some sweet and awkward moments along the way as they grow closer.
A really fun plot could be them going on an adventure during their engagement. They discover an old, forgotten magic related to love and engagement, and they have to solve some puzzles to understand it better. This adventure could strengthen their bond and also give them some unique wedding ideas.
One idea could be that Ron and Hermione accidentally stumble upon a secret passage in Hogwarts while investigating the mystery of the Prisoner of Azkaban. This passage could lead them to a hidden chamber where they find clues about Sirius Black that no one else has discovered yet.
One plot idea could be that Hugo has a unique connection to time - turners. Since Hermione was so involved with time - turners in the past, Hugo might inherit some strange ability related to them. Maybe he accidentally sends himself back in time and Ron and Hermione have to figure out how to get him back.
Well, perhaps in the fanfiction, Ron and Hermione discover that Rose has some unique magical abilities even before she is born. This causes a stir in the wizarding world, and they have to deal with unwanted attention from the Ministry of Magic. At the same time, they are also trying to balance their normal lives, like Ron still working at Weasley's Wizard Wheezes and Hermione doing research at the Ministry. They have to find a way to protect their family while also living their lives.
In this fanfiction, a great plot could be that Ron and Hermione discover some ancient magic related to their pregnancy that has ties to Hogwarts' history. As they explore this, they learn more about themselves and their relationship. Also, they could struggle with how to tell their families, especially since they're still at school. Ron might be worried about his mother's reaction, while Hermione might be concerned about how her Muggle parents will take the news. They'd have to navigate all these emotions while still being students at Hogwarts.
One plot idea could be Ron and Hermione getting trapped in a part of the Chamber of Secrets that was previously undiscovered. They have to rely on each other's skills, with Ron using his strategic thinking in wizard chess to figure out the puzzles and Hermione using her vast knowledge of spells and potions to fend off any threats. Another could be a fanfiction where they go back in time within the Chamber, perhaps to the time when Salazar Slytherin was alive and they have to change the course of events to prevent future disasters related to the Chamber.
A possible plot is that they discover the baby has a very rare magical ability. This leads them on a journey to find out more about it. Maybe they have to travel to a far - off wizarding land where they meet other witches and wizards with similar powers. Along the way, they face challenges like protecting the baby from those who might want to use its power for bad. Also, the baby could bring Ron and Hermione closer as they work together to figure out this mystery about their child.
One idea could be that they are adopted by a powerful but reclusive wizard. This wizard has his own motives for taking them in, like using their potential for a grand magical plan. Another plot could be that they are adopted into different families at first and then reunite later, realizing they have a special bond that goes beyond blood relations. Maybe they discover that their adoption was part of a prophecy protection mechanism, to keep them safe from the dark forces that are after them.
Well, you could write about their kids' relationship with the Weasley and Granger families. For example, how they interact with their grandparents, aunts, and uncles. Their kids might also have unique friendships at Hogwarts, like befriending the children of Harry and Ginny. And perhaps they inherit some of their parents' traits, like Hermione's love for books and Ron's sense of humor, which leads to various interesting situations in the story.