Well, a plot could revolve around them building their dream home. Haru might have very specific ideas about how the home should look and feel, while Tsuna is more concerned about the security aspects. They have to compromise and work together to create a home that is perfect for both of them. This could also involve some comical moments when contractors don't understand their requests or there are unexpected problems during construction.
One idea could be Tsuna, as a girl, discovers she has unique powers that are only passed down to female members of her family. She then has to navigate the challenges of keeping it a secret while also using her powers to protect her friends and family. Another could be that she is a girl in an all - boy school and has to deal with the various reactions from her male classmates, from admiration to jealousy.
One interesting plot could be Naruto using his ninja skills in the world of Tsuna. For example, he might use his shadow clone jutsu to help Tsuna deal with multiple threats at once. Another could be Naruto teaching Tsuna some of his unique chakra control techniques which could enhance Tsuna's own combat abilities in his world.
One idea could be that they go on a joint mission outside of the Metaverse. Maybe they have to infiltrate a high - society event to gather information related to a new target. Along the way, the Protagonist and Haru start to discover new sides of each other and their relationship deepens.
Another plot could involve the main character in the fanfiction realizing that they got married too young and now they are having second thoughts. This could lead to a series of self - discovery and relationship - testing events. For example, they might meet someone new who makes them question their marriage, but in the end, they realize the value of their relationship.
At first, their relationship would be full of the excitement of newlyweds. But as time passes, they would face more practical issues. For example, they might start to have small arguments about household chores. However, through communication, they would grow closer and understand each other better.
There are fanfictions where Tsuna and Haru start as friends and then gradually develop deeper feelings for each other. These stories often explore their different personalities and how they complement one another. For example, Tsuna's shyness and Haru's outgoing nature can create interesting dynamics in the relationship. They might go on a journey where they discover new things about themselves and each other, and the story unfolds as their relationship blossoms.
A possible plot for the 'Tsuna is secretly a girl' fanfiction could be that Tsuna is a talented athlete in a boys - only sports team. She has to keep her gender a secret because she's afraid of losing her position. However, as she gets closer to her teammates, she realizes that they would accept her for who she is. Along the way, there could be a rival from another team who discovers her secret and tries to use it against her, but in the end, Tsuna overcomes this obstacle and is able to be open about being a girl.
One idea could be a time - travel plot where Tsuna is sent back in time and has to rely on Reborn's teachings from the start again, but with the knowledge he already has. This would lead to some really different interactions and a chance to change certain events in a more strategic way.
Well, perhaps in this fanfiction, Harry, now Tsuna, has visions of his past life at Hogwarts during his battles in the KHR world. These visions give him an edge as he can draw on the spells and strategies he used against Voldemort to fight his new enemies. Also, his relationship with Reborn could be really interesting. Reborn might be intrigued by Tsuna's strange bursts of knowledge and skills that seem to come out of nowhere, which are actually remnants of Harry's past magical training.
Another plot could be Tsuna traveling back to a time when his father was still around. He could get to know his father better and learn some hidden family secrets. This would not only strengthen their relationship but also give Tsuna an edge in his future as the Vongola boss. He might learn about some special powers or techniques that his father knew but never got to pass on to him in the original timeline.