Another idea is that Luna has some unique premonitions during her pregnancy related to the future of the wizarding world. It could be that their unborn child is somehow connected to a new magical discovery or a coming event. Harry would be both excited and a bit scared as he wants to protect his family but also knows they have a role to play in the bigger picture.
Perhaps the pregnancy is a result of a magical accident or a powerful spell gone wrong in a way. They initially panic but then decide to embrace it. They go on a journey to find a way to ensure the baby is healthy and safe. Along the way, they meet new characters and face challenges that test their relationship and their beliefs in magic.
One idea could be that Harry and Luna go on a secret mission together to discover a long - lost magical artifact. They might face various challenges like dark creatures and tricky spells along the way. Another plot could involve them exploring a hidden part of Hogwarts that no one else has found before, uncovering ancient secrets of the school. Maybe they also have to deal with some sort of misunderstanding among the other students who don't understand their unique friendship.
I'm not sure of a specific fanfiction on this. However, you could try searching on popular fanfiction websites like Fanfiction.net or Archive of Our Own. Look for tags related to 'Luna Lovegood' and 'pregnancy' within the Harry Potter section. There are often many creative and well - written fanfictions out there that might fit what you're looking for.
In a dark fanfiction, Voldemort could have placed a dark spell on Harry long before he knew. As Harry grows, the spell starts to take effect, making him darker. Luna, being an outsider in many ways, notices the changes in Harry. She decides to research ancient magic to find a way to break the spell. Along the way, she discovers secrets about her own family's magic that could be the key to saving Harry and the wizarding world from the impending darkness.
One plot idea could be Luna and Harry teaming up to solve a mystery about a hidden chamber in Hogwarts that has been forgotten for centuries. They use Luna's out - of - the - box thinking and Harry's courage to uncover secrets and face the challenges within.
A different plot could be centered around Luna's pregnancy in the context of her family. Maybe her pregnancy re - awakens some long - forgotten family magic. Her family has always been a bit of an enigma in the wizarding world. Her pregnancy could trigger some magical events that draw the attention of the Ministry of Magic. The Ministry might be suspicious or interested in how this could affect the balance of magic in the wizarding world. Meanwhile, Luna is just trying to have a normal pregnancy and raise her child in a world that is both curious and sometimes a bit hostile towards her family's unique magic.
Another plot could be set during Harry's time as a teacher at Hogwarts. Luna is also there as a guest lecturer on magical creatures. They end up working together to deal with a group of mischievous students who have accidentally released a dangerous but fascinating magical being on the school grounds. They have to use their combined knowledge and skills to catch it without harming it or the students.
One great fanfiction could be about Luna and Harry going on an adventure in the Forbidden Forest that wasn't in the original books. It might involve them discovering a new magical creature and having to protect it from dark wizards. Another could be a story where Luna helps Harry deal with the trauma of the final battle, showing her empathetic side in a more in - depth way.
One great fanfiction idea could be that Luna discovers a hidden Nargle colony that has a special connection to the ancient magic of Hogwarts. She tries to convince her friends in Gryffindor, including Harry, to help her protect the Nargles from some dark wizards who want to use their magic for evil.
One idea could be that Snape discovers Luna has a unique ability to communicate with magical creatures in a way that could help him in his spying for Dumbledore. He reluctantly teams up with her, and along the way, they learn to understand each other's outcast natures.
A possible plot could be that after the defeat of Voldemort, Harry and Luna start to get closer while helping to rebuild Hogwarts. They discover a hidden part of the castle together and that shared adventure leads to their relationship blossoming and eventually getting married.