At the beginning, their relationship might be based on curiosity. Caius is curious about Bella's cousin because she's related to Bella, who has her own connection to the vampire world. And Bella's cousin is curious about Caius because he's so different from anyone she's ever met. As time passes, they find themselves drawn to each other. Caius might start to change his views on humans a bit because of her, and she might become more accepting of the vampire lifestyle. Their relationship could be a journey of self - discovery for both of them.
It could start with animosity. Caius might see Bella's cousin as a potential threat or just an annoyance at first. But then, as he gets to know her better, he realizes she has a kind heart. He starts to protect her from other vampires or dangers in Forks, and slowly, feelings of love or at least deep affection develop.
One idea could be that Bella's cousin comes to Forks for a visit. Caius, while on some Volturi business in the area, catches sight of her. He's intrigued by her different scent compared to the other humans in town. Their relationship could start with some tense encounters as Caius tries to figure out why she's so interesting to him.
In many fanfictions, Bella starts to understand the complex world of the Volturi better. She learns about their laws, politics, and hierarchies. Caius, in turn, begins to see Bella not just as a mate but as an equal. He might start to value her opinions more and include her in Volturi affairs. For instance, Bella could use her knowledge of the human world to help Caius make decisions regarding vampire - human relations.
At first, they might be a bit cautious around each other. But as they get to know each other better, they could become really close friends. Annabeth could be like an older sister to Bella, guiding her and protecting her.
The relationship in fanfiction can be very diverse. Some fanfictions portray it as a slow - burn romance. Marcus, being an ancient vampire, has a lot of past baggage, and Bella has her own issues with the vampire world. They start by having simple conversations, gradually getting to know each other better. In other stories, it's more of a friendship - based relationship. They might start to protect each other from the threats within the Volturi or from other vampires. And in some more creative fanfictions, their relationship is based on a shared spiritual or magical connection that is unique to them and helps them grow both as individuals and as a pair.
At first, it might be a bit rocky. Bella, being human and now blind, is in a very vulnerable state. Caius, as a powerful vampire, may come off as intimidating. But as time goes on, they start to develop a deep bond. Caius learns to be more gentle and caring, and Bella starts to trust him more and more.
One great Caius Volturi and Bella fanfiction is 'The Volturi's Obsession'. It explores an alternate universe where Caius has a more complex relationship with Bella. Another is 'Caius and Bella: A Forbidden Bond' which delves into the challenges they face due to their different natures.
The themes of transformation and self - discovery are quite common. Bella's transformation into a vampire (if it occurs in the fanfic) and how that affects her relationship with Caius is often explored. Caius, too, may go through a form of self - discovery as he gets involved with Bella. Another theme is the struggle against fate. Their relationship is often seen as something that is not meant to be according to the rules of their world, but they fight against that in the fanfiction.
One way their relationship could develop uniquely is through a shared interest in art. Suppose Bella has an appreciation for ancient vampire art that Caius is also fond of. They start to bond over discussing different artworks and the stories behind them. This common interest bridges the gap between them, and Caius begins to see Bella not just as a human or Edward's mate, but as an individual with her own charm. As their relationship grows, Caius might even start to protect Bella from the Volturi's harsher rules because of this newfound connection.
They could start off with a bit of friction as they are likely to have different personalities. But over time, they would grow closer. Maybe through shared experiences like going to school together or dealing with family problems.
They're an interesting pairing because they are so different. Caius is from the ancient and powerful Volturi, with a strict view of vampire laws, while Bella is a human - turned - vampire with a very different moral compass. This contrast can lead to really engaging storylines in fanfiction.