Well, it could be about a physical competition between Jacob and Emmett. Maybe they are competing in something like strength tests in a fictional world where their sizes play a role in the outcome.
Another possibility is that in this fanfic, the idea of 'bigger' is more metaphorical. Jacob could be considered 'bigger' in terms of his popularity or influence in a particular community or group compared to Emmett, and the story could explore how this affects their relationship and the dynamics within the group.
On the other hand, it could also lead to a change in the power dynamic. If others in the 'Twilight' world take Jacob's statement seriously, it could mean that Jacob is seen as a more dominant figure compared to Emmett. This might affect how other characters interact with them. For example, if there are battles or group decisions, Jacob might be given more authority based on this claim.
Obviously, Jacob and Emmett are the main characters. Jacob is the one who claims to be bigger than Emmett.
One possible scenario is during a battle or a physical competition. The author could write that Jacob has grown in size and strength due to some newfound werewolf ability or training. So when he faces Emmett, he towers over him and easily overpowers him. Another scenario could be in a situation where Jacob needs to protect Bella from Emmett. To seem more intimidating, he is described as being much bigger. For example, he stands in front of Bella, his large frame blocking Emmett's view completely.
Another possibility is that it's a statement of self - confidence. Jacob could be trying to assert himself over Emmett. He might be in a situation where he wants to show that he is not intimidated by Emmett. Maybe he is competing for something, like Bella's attention, and by saying he's bigger, he's trying to prove his worth and superiority in that regard.
Well, in some Twilight fanfictions, Jacob might be described as physically larger in terms of his overall build. Maybe he has broader shoulders, more muscular mass that makes him seem even bigger than Emmett. It could be emphasized through descriptions of their encounters or when they are standing side by side. For example, the author might write about how Jacob's presence seems to overshadow Emmett's, not just in height but also in the width and power that his body exudes.
One possible plotline could be about a character who has a menacing appearance but is actually kind-hearted. For example, a vampire who is misunderstood in a small town. People fear him because of his nature, but he's determined to show that he won't hurt anyone. He might start by saving a child from a dangerous situation, like a burning building. This could be the beginning of his journey to gain the trust of the townspeople.
In some Twilight fanfictions, Jacob's werewolf form might be described as larger in terms of physical stature compared to Emmett's vampire form. Maybe it's about his height, or his overall build when transformed. For example, his werewolf shape could be more bulky and take up more space, while Emmett, though strong as a vampire, might be more streamlined in comparison.
Perhaps Leah discovers something about Jacob that makes her feel sorry for him, and she cries out of empathy. Jacob, in turn, is touched by her reaction and also sheds tears. This could be related to his struggles with his werewolf nature or his identity in the Twilight universe. Their shared moment of tears could lead to a new understanding between them and a shift in their relationship dynamic.
One possible plotline could be that Emmett, as Bella's landlord, is very protective of her. Maybe he notices some strange things going on in the neighborhood related to the vampire - human world in Twilight, and he tries to keep Bella safe without revealing his own true nature (if he's a vampire in the fanfic).
A possible plotline could be that Bella's new status as Emmett's sister makes her more confident in the vampire world. Since Emmett is a strong and outgoing vampire, he might teach Bella how to better use her vampire abilities if she were to become one in the story. This could lead to her getting involved in more dangerous situations but also growing as a character.