One possible reason could be that Bella has a certain allure or mystery that Damon finds more captivating than Elena. Maybe Bella represents a new and different kind of challenge for him.
Perhaps Damon sees in Bella a different set of values or a more unwavering loyalty. Elena has her own complex relationships and loyalties in the 'Vampire Diaries' world, and Damon might feel that Bella can offer him something purer in terms of a connection. For example, Bella's love for Edward in the 'Twilight' series is extremely intense and unwavering, and Damon could be drawn to that kind of devotion.
One possible reason could be that Bonnie has a unique strength and independence. She's a powerful witch, and Damon might be attracted to that power. Also, Bonnie has always been there for him in tough situations, more so than Elena in some ways.
This change would also have an impact on the other characters. Stefan, for example, might be caught in the middle. He has his own relationship with Damon and also cares about Elena. The fanfiction could create a whole new set of alliances and rivalries. Characters from the 'Twilight' series might also be involved in some way, further complicating the relationships. Overall, it would be a big upheaval in the existing relationship dynamics.
Elena might be heartbroken. She probably expected Damon to always be there for her, so his choice of Bonnie would come as a shock.
One reason could be Jacob's more down - to - earth nature. He represents a more normal, warm - hearted life compared to Edward's rather cold and sometimes brooding vampire existence. Bella might be drawn to the simplicity and closeness to nature that Jacob offers.
One aspect of their married life in fanfiction could be their social life. They might host parties for their friends, both human and supernatural. Elena would be the warm hostess, and Damon would be the charming one, entertaining the guests with his witty remarks. And at night, they would just enjoy the quiet togetherness, maybe stargazing and reminiscing about their long and eventful journey to get married.
Elena might show her jealousy by being overly critical of Bella. For example, she could constantly find fault in Bella's actions or decisions in the fanfiction.
One possible reason could be Snape's long - standing dislike for James Potter, Harry's father. Since Draco is from a pure - blood family like Snape himself, and Snape has a certain affinity for the pure - blood traditions and values, he might choose Draco. Also, Draco was in Slytherin, Snape's own house at Hogwarts, and he might have felt a stronger sense of loyalty to his house and its students.
One possible reason could be that Peter has a certain allure of mystery. Stiles is a curious character, and Peter's complex past and often ambiguous motives might draw Stiles in. Peter also has a more unorthodox way of dealing with things, which could seem exciting compared to Scott's more straightforward approach.
In this fanfiction, Bella is likely the main focus. Because the whole premise is about Elena being jealous of Bella, which implies that Bella is at the center of whatever relationship or situation is going on with Damon. Elena's jealousy is directed towards Bella, so the story would probably revolve around Bella and how she deals with Elena's jealousy and her relationship with Damon.
One possible storyline could be that they face many challenges in their relationship while expecting a baby. Their friends might have mixed reactions, some being overjoyed while others being worried about the vampire - human nature of their union. They could also struggle with preparing for the baby's future in a world full of supernatural threats.