One possible scenario could be that they meet secretly in the Forbidden Forest. Luna's unique understanding of the magical world might draw Harry in, and they share quiet moments there, away from the prying eyes of others. They might talk about their fears regarding Voldemort and find comfort in each other's company.
They could have a secret hideout in an abandoned part of Hogwarts. There, they study ancient magic together, which deepens their bond. As they explore the magic, they also explore their feelings for each other. Their relationship is a secret mainly because they are both a bit shy and also worried about how their friends might react.
Some of their friends might be initially shocked. For example, Hermione might be a bit taken aback as she is used to Harry being more focused on the fight against Voldemort. But she would eventually come around. Ron, on the other hand, might tease Harry a bit at first but support them in the end.
Maybe they are sitting by the Black Lake. They could be discussing their experiences in the wizarding world. Harry might be talking about his fight against Voldemort, and Luna would be offering her unique, otherworldly perspectives, perhaps comparing Voldemort to some dark magical entity she's heard of in old tales.
A scenario could be that Draco and Hermione are forced to work together on a project by a teacher who doesn't know about their animosity. At first, they are reluctant, but as they start working, they discover new sides of each other. Their secret relationship begins to form as they realize they have more in common than they thought. They might start sneaking off to empty classrooms to continue their work privately. Also, in some fanfictions, they might discover that they are both being targeted by a common enemy. This makes them rely on each other more and strengthens their secret bond as they try to figure out who is after them and why, all while keeping their relationship under wraps.
They could become very close friends. After the war, they both have a shared understanding of the trauma and changes they've been through. They might support each other in rebuilding their lives at Hogwarts or in the wizarding world in general.
A possible plotline is that Luna enters the Triwizard Tournament as an unexpected champion. Harry, already in the tournament, teams up with her to face the challenges. They use their combined skills, Harry's Gryffindor courage and Luna's Ravenclaw wisdom, to overcome the tasks.
Perhaps in the fanfiction, the secret revealed could be about a hidden connection between the Forgers and some powerful organization. It might turn out that Anya's adoption was not as random as it seemed, and there's a deeper plot behind it. Or it could be that a family heirloom or something that the Forgers possess has a secret power or significance that gets uncovered, leading to all kinds of adventures and threats.
One common scenario is during the fight against the dark forces. Harry might realize Luna's unique perspective and abilities are valuable. So he could ask her to use her intelligence and knowledge of the magical world's oddities to find solutions to problems. For instance, Luna might know about some forgotten spells or magical creatures that can be used to defeat the enemy.
One scenario could be that Harry and Luna decide to prank the Slytherins by making their common room look like a giant pumpkin patch overnight. They use magic to grow pumpkins everywhere, and when the Slytherins wake up, they are completely bewildered. Another could be that they enchant the Quidditch balls during a Slytherin - Gryffindor match to make them fly in zig - zag patterns, causing chaos on the pitch.
One possible scenario could be that they start as rivals. Naruto, with his determination, and Temari, with her strong - willed nature, initially compete in various ninja tasks. But as time passes, they gradually come to respect each other's skills. For example, during a joint mission, Naruto's unwavering spirit might inspire Temari to be more open - minded about Konoha ninja. And Temari's strategic thinking could help Naruto in battle, leading to a deeper bond between them.
It could be about Harry and Luna going on a secret adventure in the Forbidden Forest. Maybe they discover a new magical creature that no one else knows about.