A possible plot might be that it was a complete accident. They were working on a school project together in an abandoned classroom at Hogwarts. One thing led to another as they were discussing their future dreams and fears. There was a lot of nervous laughter at first, but then it turned into a very special and memorable moment for them. It was unexpected but felt so right, like it was always meant to happen in that unplanned way.
Well, a plot could involve them having their first time during a time of great danger. They realize that life is short and they don't want to waste any more time hiding their feelings. So, in the middle of a battle against the dark forces (not directly in the heat of it but in a relatively safe place nearby), they share this intimate moment as a way of reaffirming their love and hope for the future. It shows that love can bloom even in the darkest of times.
One idea could be exploring how they overcame their initial shyness. Maybe it was during a magical adventure where they had to rely on each other deeply. Another could be a situation where they finally confessed their feelings after a long time of pining, and the first time was a very tender and emotional moment. For example, perhaps it was under a starry sky at Hogwarts, surrounded by the magic of the castle.
Another interesting plot could be that she is transported back in time to the era when her parents were at Hogwarts. She gets to see them as students, experience their school life, and maybe even has a chance to change some small events that could have a big impact on their future and her own present. This would be a great way to explore their relationships and the world of Hogwarts in a different time period.
One idea could be that they face challenges from the wizarding world due to their relationship while Lily is pregnant. Maybe there are threats from dark forces who want to harm them or their unborn child.
Another interesting plot could be that they are sent forward in time instead. They have to adapt to the future wizarding world which has changed a great deal. They might be shocked by new magic technologies and different social structures, and their reactions to these changes can make for an engaging story.
One idea could be that they return with new magical abilities. Maybe James has the power to control time briefly, which he uses to prevent some small tragedies in the wizarding world. Another could be that they return to find that Harry has changed the wizarding world in ways they never expected, and they have to adapt to this new world order.
A plot could revolve around the challenges they face during the pregnancy. For example, Lily might have some difficult symptoms, and James has to learn how to take care of her while also dealing with his own insecurities about becoming a father. They could also face some threats from the wizarding world's dark forces, adding an element of danger to the story.
A really interesting plot could be that James and Lily, alive, work with Dumbledore to create a new school of magic. This school would focus on teaching students how to defend against the Dark Arts in a more practical and hands - on way. Harry would be one of the first students there. They could also develop new magical artifacts that could help in the fight against evil. And the family could have adventures all over the world to find the ingredients and knowledge needed for these new creations.
One interesting plot idea could be that Lily and James, alive and well, decide to train Harry in magic from a very young age. This would make Harry an even more powerful wizard earlier on. They could also use their influence to reform the wizarding world, starting with Hogwarts. For example, they might introduce new courses that focus on both light and dark magic, teaching students how to defend against the dark arts in a more comprehensive way.
One plot idea could be that James and Lily go into hiding with Harry instead of being killed. They could raise him in a secret location, teaching him magic away from the prying eyes of Voldemort. Another could be that they fake their deaths and then work secretly to undermine Voldemort's forces. For example, they could use their knowledge of the Death Eaters to expose their plans and turn some of them against Voldemort.
One idea could be that Lily travels forward in time and meets Harry as an adult. She gets to see all the good he has done and is filled with pride. Another could be Harry traveling back in time to save Lily from Voldemort, but in doing so, he risks changing the entire future. A third plot idea is that they both get trapped in a time loop together and have to figure out how to break it while also learning more about each other.
One idea could be that James and Lily have to work together to organize a big event at Hogwarts, like an inter - house tournament. During this, they start to see each other in a new light and their relationship begins to develop beyond just being colleagues in their head positions.