One possible plotline could be that Marcus discovers Bella's blindness and is initially hesitant about their relationship but then grows to see it as something that makes her unique and special. He might then become very protective of her.
A plotline could involve Bella's family's reaction to her relationship with Emmett. Given her blindness, they might be even more worried about her getting involved with someone like Emmett. Also, the fanfiction could show how Bella and Emmett communicate on a deeper level. Since she can't see, they might develop a stronger telepathic or emotional connection that is unique to their relationship.
I'm sorry I don't have specific fanfiction stories to recommend directly. But you can try searching on popular fanfiction websites like Archive of Our Own or FanFiction.net. Use the key phrases 'bella is marcus mate and bella is blind' in the search bar, and you might find some interesting stories there.
Another plot could be that they are on opposite sides of a conflict initially. But as they realize they are mates, they have to find a way to reconcile their differences and work together. This could involve a lot of internal struggle for both of them as they deal with loyalty to their respective sides and their new - found bond.
Power dynamics might also be a theme. Marcus may have certain powers or a position within the story's world, and how that affects his relationship with Bella could be explored. For example, if there are other characters who oppose their union because of Marcus' power or status. Another common theme could be the struggle against outside forces. There might be other characters or groups that try to keep Bella and Marcus apart, creating conflict and drama in the story.
One possible plotline could be the struggle against other vampires who oppose their relationship. Another might be Bella adjusting to the vampire world in a different way than in the original stories, with Damon as her guide. Maybe they go on adventures together to protect their relationship from various threats.
I'm not sure about specific 'bella is marcus mate fanfiction' off the top of my head. But often, fanfiction communities on social media, like certain Facebook groups dedicated to fanfiction, might be a good place to ask for recommendations. Some members might be really into that particular pairing and could point you in the right direction.
Well, perhaps she's scared because she doesn't fully understand what it means to be Sam's mate. There could be some sort of mystery or unknown elements associated with this bond. It might also be that she's afraid of the potential danger that Sam's world or position might bring into her life. For example, if Sam has enemies, she could be worried about being targeted.
A possible plotline could be that Bella's sister is initially in danger, and Carlisle saves her. This event sparks their connection. Then, they start to secretly meet, trying to hide their relationship from both the human world and the Cullen family. Another plotline might be that Bella's sister has a special power that attracts Carlisle, and they explore their relationship while trying to figure out what this power means for them.
Well, it could start with Bella being brought to the Volturi under mysterious circumstances. As she becomes the king's mate, she discovers secrets about the Volturi's past that could change everything. She might also develop new powers or abilities due to her connection with the king. This could lead to a series of events where she has to prove herself to the Volturi, while also trying to maintain her own sense of self. There could be a lot of tension between her loyalty to the Volturi king and her old ties to her human family and friends in Forks.
Another plotline could involve Bella being used by the Volturi in their political games against other vampire covens. She, being a human - turned - mate, has unique abilities or a certain influence that they want to utilize for their own gains. And as she realizes this, she has to figure out how to resist or turn the situation to her advantage.