It could be that Rock makes a deal with an enemy of Revy's. In the world of Black Lagoon, loyalty is a big thing. If Rock betrays Revy in some way, even if it's not intentional, Revy might see killing him as the only way to deal with the situation. For example, if Rock unknowingly helps an enemy get closer to Revy or her crew, she might take his life in a fit of rage.
Perhaps in this fanfic, there is a power struggle within the group. Rock might be gaining too much influence or power, and Revy, who is used to being in control and having a certain position in the group, feels threatened. She may then decide to eliminate Rock to maintain her status and the balance of power within the Black Lagoon crew.
One possible motive could be that Rock discovers something dangerous or unethical about the underworld operations that Revy is involved in. Maybe he threatens to expose it, and Revy, being a character who often acts on impulse and to protect her own interests, decides to kill him to keep the secret.
The dynamic between the other characters would change drastically. For example, Dutch, who has some sort of father - figure relationship with Rock, would be deeply affected. He might turn against Revy, or the whole crew could fall into chaos and disarray. Also, the story's themes of redemption and the struggle between good and evil would be altered. Without Rock, there would be less hope for any of the characters to find a way out of the violent underworld they are in.
Their relationship can be developed through shared danger. For example, if they are in a shoot - out together, Rock could save Revy in a non - traditional way, like using his knowledge of the environment to outwit the enemy instead of using guns. This would make Revy see Rock in a new light.
I'm not entirely sure as it could be a very specific or even a made - up fan - created concept. It might be a fanfic related to 'Black Lagoon' that involves something about 'rock kills' which could potentially refer to a rock - themed or rock - music - related violent or dangerous element within the fan - written story.
One possible plotline could be that Rock and Revy are in a dangerous situation during a mission. As they face a near - death experience, in a moment of relief and pent - up emotions after surviving, they share a kiss. Then they have to deal with the consequences of this new development in their relationship while still being in the middle of the criminal underworld they operate in.
A common theme is the exploration of their complex relationship. Revy is tough and Rock is more of an ordinary guy in a sense, so the fics often play with how they interact and grow closer. Another theme could be adventure, as they are in the dangerous world of 'Black Lagoon' and fanfics might send them on new and exciting escapades together.
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.
One great fanfiction could be 'Revy's Redemption'. It delves into Revy's character, exploring her past traumas and how she might overcome them. It has some really well - written action scenes that are in line with the tone of Black Lagoon.
You could start by looking on popular fanfic websites like Archive of Our Own (AO3) or FanFiction.net. Just search for the exact title 'black lagoon rock kills fanfic' in their search bars.
Common themes in 'Black Lagoon Revy and Rock fanfiction' include the idea of loyalty. Despite their differences, they often show loyalty to each other. There's also the theme of moral ambiguity. Rock has to grapple with his own morals in the immoral world he now inhabits with Revy, and this is often explored in fanfiction.