For Boruto, he could develop from being a bit overconfident to a more mature and reliable ninja. Maybe through his interactions with Sumire, he learns to think more before acting. For Sumire, she could become more assertive. Working with Boruto, she might find the courage to voice her opinions more often and take on more leadership roles.
One common theme is the clash between the violent and dangerous yakuza world and the tender feelings of love. Another is the idea of redemption through love. The yakuza character often tries to change or leave his criminal past for the person he loves.
The Yakuza games story portrays Yakuza culture in several ways. It shows their hierarchical structure. The higher - ups have great power and respect, and the lower - level members have to follow strict rules. Also, their sense of justice within their own world is depicted. They have their own way of dealing with disputes and traitors which is part of their unique culture.
Well, perhaps in the fanfic, there could be a plot where Boruto gets injured during a battle and Sumire has to take care of him. While taking care of him, she discovers a side of Boruto that he usually doesn't show. And Boruto, in his vulnerable state, starts to see Sumire in a new light. This could lead to a budding romance between them.
Writers often portray Boruto and Sumire's love in fanfiction as a kind of young, innocent love. They might write about how Boruto makes Sumire blush with his cheeky comments, or how Sumire's presence makes Boruto more focused on his tasks. It's all about the small, cute interactions that show the start of their feelings for each other.
Their relationship could develop through shared experiences. For example, if they both get involved in a dangerous fight against a common enemy, they'll start to trust each other more.
One idea could be that they go on a secret mission together. During the mission, they face various challenges that test their skills and teamwork. This could lead to a deeper understanding and bond between them.
One popular yakuza romance novel is 'The Yakuza's Bride'. It tells a story of a young woman who falls in love with a yakuza member and the challenges they face together. Another is 'Yakuza's Love Redemption' which focuses on a yakuza's journey to change for the love of a woman.