A really interesting plot could be that there is a power struggle in their world. Rock and Balalaika find themselves on different sides at first, but as the situation unfolds, they realize that they need to work together. They have to overcome their differences and form an alliance to deal with a greater threat that could destroy everything they care about. This would involve a lot of character development for both of them as they struggle with loyalty and their own beliefs.
Perhaps a plot where Balalaika is in trouble and Rock, using his unique skills and knowledge, tries to rescue her. This could lead to a deeper bond between them as they fight their way out of difficult situations together. In the process, Rock might learn more about Balalaika's past and what made her who she is today.
A fanfiction could explore a scenario where Rock and Balalaika are stranded together in a remote location after a deal goes wrong. They have to rely on each other to survive, which is a huge change from their normal relationship in the show. As they struggle, they start to understand each other on a deeper level.
Another plot could involve Balalaika having to protect a valuable artifact that has some connection to her past. This could draw her into a conflict with other powerful factions in Roanapur, all while she is haunted by the memories associated with the artifact. Maybe it was something she lost during a war and now she has a chance to regain it, but at great risk.
The relationship can be developed through shared experiences. For example, if they are in a life - or - death situation together, they will have to rely on each other. This mutual dependence can lead to a deeper understanding and respect for one another.
One plot idea could be that Gretel and Rock are forced to team up during a dangerous mission in the criminal underworld of Black Lagoon. They have to rely on each other's skills, with Gretel's combat abilities and Rock's strategic thinking to get out alive.
One idea could be exploring the backstories of the mercenaries in more detail. For example, delving into how Revy became such a skilled fighter. Another could be creating a new mission for them that involves a powerful and mysterious enemy. Maybe a shadowy organization that has ties to their pasts.
Explore their pasts more. Maybe Rock discovers something about Balalaika's family or early life that makes him empathize with her even more. And Balalaika could learn about Rock's reasons for being in Black Lagoon in the first place, which could lead to a more complex and nuanced relationship.
Well, I've heard of a fanfic titled 'Balalaika's Influence on Rock'. This one focuses on how Balalaika's strong personality and leadership start to have an impact on Rock's way of thinking. He begins to see the world in a different way, more like how Balalaika does. Another good read could be 'Rock's Struggle with Balalaika's World' where Rock tries to adapt to the dangerous and complex world that Balalaika is a part of.
Perhaps a fanfic where Rock and Revy get stranded on an island during one of their smuggling runs gone wrong. They have to rely on each other to survive, and in the process, they start to understand each other better. Revy learns more about Rock's ideals and Rock gets a deeper insight into Revy's survival instincts.
Another plot could involve Rock and Revy getting stranded on an uncharted island during one of their jobs. They must rely on each other to survive. Rock uses his wits to find food and water sources, while Revy protects them from any threats. This situation could also lead to a deeper understanding between them.
Balalaika is often portrayed as a powerful and intimidating figure. In fanfiction, she could be the driving force behind a major plotline involving Eda. Maybe she recruits Eda for a special task that only Eda can do because of her connections in the underworld.