Bella's inquisitive nature can draw out Paul's more protective side in fanfiction. For instance, when she starts asking questions about the werewolf lore, Paul feels the need to shield her from the more dangerous aspects while also sharing enough to satisfy her curiosity. Their personalities can also clash when Bella tries to be independent and Paul's over - protectiveness kicks in.
In fanfiction, Paul's sense of loyalty to his pack can sometimes conflict with Bella's own desires. But Bella's ability to empathize can help her understand Paul's position. And Paul, in turn, can be drawn to Bella's kindness and her way of seeing the world, which is different from what he's used to in the werewolf community.