Finding a specific 'Belle killed Rumpelstiltskin' fanfic can be quite a challenge. You could start by searching on major fanfic websites like Archive of Our Own (AO3) or Fanfiction.net. Use the relevant search terms in the search bars of these platforms. But keep in mind that there may not be a lot of such fics, or it may be quite difficult to sift through all the search results to find the exact one you're looking for.
I'm not sure if there is an exact 'Belle killed Rumpelstiltskin' fanfic. Fanfics can vary greatly in content. It could be a very dark and alternate - universe take on the relationship between Belle and Rumpelstiltskin. Maybe in such a fanfic, there could be some deep - seated conflict that led Belle to take such a drastic action, like Rumpelstiltskin doing something unforgivable to Belle or those she loves.
The plot could involve Belle being in a much darker situation than in the original story. Maybe she makes a deal with Rumpelstiltskin that has unforeseen tragic consequences. For example, she might try to save her village but end up sacrificing her own freedom in a more extreme way. Rumpelstiltskin, being his devious self, could twist the deal so that Belle finds herself trapped in a never - ending cycle of despair and regret.
Belle might interact with Death with fear at first. But being a strong - willed character, she would soon start to question Death's motives. For example, she could ask Death why he is involved with Rumpelstiltskin's schemes. She might also try to appeal to Death's sense of fairness, showing him how Rumpelstiltskin's actions are harming innocent people.
One possible scenario could be that Rumpelstiltskin, despite his dark past, becomes extremely protective of Belle during her pregnancy. He might use his magic to ensure her comfort and safety, like creating a special charm to keep away any potential harm. He could also be seen gathering all the rare and precious items from his collection to make a perfect nursery for their unborn child.
One possible scenario could be that Belle, in her quest for knowledge, stumbles upon a realm where Death has a pact with Rumpelstiltskin. Maybe Belle is trying to break a curse and she has to negotiate with Death, who is using Rumpelstiltskin's magic as a tool. For example, Death could be using Rumpelstiltskin's spinning wheel to measure the fates of people. Belle then has to outwit both Death and Rumpelstiltskin to save her village from a plague that Death has brought as a result of the pact.
In the fanfic, Belle could sacrifice her own happiness to protect someone else from Rumpelstiltskin's deals. For instance, if her family is in danger, she might offer herself to Rumpelstiltskin without fully understanding the consequences. This act of sacrifice could then lead to a downward spiral of events that ultimately result in a tragedy. Her selfless act could be twisted by Rumpelstiltskin to his own advantage, causing her to lose more than she bargained for.
Perhaps it could be a story where Belle is trying to find a way to break a curse that Rumpelstiltskin has placed on her town. In the process, she hires Dead Shot to protect her from the dark forces that Rumpelstiltskin has at his disposal. As they journey together, they learn more about each other's pasts and motives, and Dead Shot starts to question his own life of killing, inspired by Belle's goodness.
Belle's inquisitive mind would make her want to understand both Dead Shot and Rumpelstiltskin. She would be the one to ask questions and try to find common ground. Dead Shot, who is used to operating alone, would be a bit annoyed by Belle's attempts at first but then start to appreciate her company. Rumpelstiltskin, with his complex personality, would play mind games with both of them. He would use Belle's compassion against her and try to tempt Dead Shot with rewards. Belle would strive to bring some humanity to Dead Shot and expose Rumpelstiltskin's true motives.
There's a fanfiction titled 'The Kiss That Changed Everything'. It delves into the moment of their kiss and how it affects their relationship. It shows how Belle's kindness starts to thaw Rumpelstiltskin's cold heart. The author does a great job of building up the tension before the kiss and then exploring the consequences afterwards.