Shikamaru might possess a magical ability similar to Legilimency. His ability to read people in Naruto could translate into being able to read minds in Hogwarts. This would give him an edge in many situations. Sakura could have an extraordinary gift for Healing Magic. Combining her existing medical skills with Hogwarts' magic, she could heal the most severe of wounds and even develop new healing spells.
Shikamaru, being the lazy yet intelligent character from Naruto, would likely find the magical world of Hogwarts both fascinating and a bit of a bother. He might be intrigued by the complex magic but would grumble about having to study it. Sakura, on the other hand, would be eager to learn all about magic. She'd probably be in the library a lot, trying to master spells. Her combat skills from Naruto could translate well into dueling at Hogwarts.
One plot twist could be that just as Sakura is about to say yes, an old enemy from their past appears and challenges Shikamaru. Shikamaru has to prove himself worthy of Sakura by defeating the enemy. Another could be that Sakura discovers a long - lost family secret that makes her question whether she should get engaged. Maybe she has a hidden power that could put Shikamaru in danger if they are together.
One possible plot twist could be that Shikamaru is actually on a secret mission that he can't tell Sakura about, and she starts to suspect he's hiding something from her, causing tension in their marriage. For example, he might be working undercover to expose a traitor in Konoha and his secrecy makes Sakura think the worst.
In the 'sakura goes to hogwarts fanfiction', it could be that Sakura is a transfer student. She would face the challenges of adapting to the different magical system in Hogwarts. For example, she has to learn about potions and spells in the Hogwarts way. Along the way, she might discover a hidden mystery in Hogwarts that only she, with her special background, can solve. Maybe it has something to do with an ancient artifact that links her world to Hogwarts.
He might have enhanced control over the Hogwarts wards. Since he is the heir, he could be able to manipulate the protective spells around the school more easily than others.
They could have adventures full of strategic battles. Shikamaru's intelligence would complement Naruto's impulsiveness. For example, in a mission against a powerful enemy ninja, Shikamaru could devise a complex plan while Naruto uses his determination and powerful jutsu to execute it. They might also face challenges within the team, like disagreements on how to approach a mission, but ultimately grow closer as comrades through these experiences.
They could go on an adventure to find a rare and powerful jutsu. Naruto would be eager to learn it, Sasuke would see it as a way to increase his power, and Shikamaru would be dragged along reluctantly at first. But during the search, they discover that the jutsu has a dark side that they must decide whether to use or destroy.
Well, it could be that there's a high school dance coming up. Shikamaru doesn't really want to go, but Sakura convinces him. At the dance, they both have some awkward moments but also some really fun ones. And through this experience, they realize they have more in common than they thought. For example, they both care a lot about their friends and are actually quite loyal. And this realization starts to build a stronger bond between them.
One possible story could be that Shikamaru and Sakura start off as friends. They've always been comrades in their ninja village. As time passes, they find themselves growing closer during a difficult mission. They realize they have a deep connection and feelings develop. Eventually, they decide to start a family. Their baby could inherit Shikamaru's intelligence and Sakura's strength. It would be a new chapter in their lives filled with the joys and challenges of raising a child in the ninja world.
The plot could revolve around a mission where they are forced to take care of a baby for some reason. This baby then turns out to be their own in a strange twist. Shikamaru is initially reluctant but slowly warms up to the idea of fatherhood. Sakura is more immediately attached. As they try to find out how this happened, they also grow closer as a couple and start to envision a future with their new family member.