Perhaps Lucy is a new character in the Twilight setting who is brought in to sing at a special event. Her singing stirs emotions in the main characters like Edward or Bella. It could lead to a series of events where she becomes involved in their world in unexpected ways, like getting caught up in the vampire - werewolf feud because of her influence through singing.
It could be that Lucy is an ordinary human who discovers she has a supernatural - influenced singing ability. In the Twilight universe, this could make her a target or a valuable asset. She might start singing with some of the characters, and through that, she uncovers secrets about the Twilight world and her own place in it. Her singing could also be a form of magic in the context of the fanfiction, with unforeseen consequences.
One possible plotline could be that Lucy has a hidden talent for singing, and in the Twilight world, she uses her singing to attract the attention of a certain vampire or werewolf. Maybe it creates a new kind of bond or rivalry among the supernatural beings.
I'm not sure of specific 'Singing with Lucy Twilight' fanfiction off the top of my head. You could try searching on fanfiction websites like Archive of Our Own. They usually have a wide variety of fan - created stories.
One possible plotline could be that the oc has a different set of skills or powers compared to Lucy, which changes the way the story unfolds. For example, if the oc is a magic user with a more aggressive style in a world where Lucy was more of a support - type magic user.
A possible plotline could be that Lucy Chen decides to keep her pregnancy a secret at first. She's worried about how it will affect her work and her standing in the department. As she progresses through the pregnancy, it becomes harder to hide, and she has to face the consequences.
Perhaps the rogue is hired by an evil force to kidnap Lucy. She could be the daughter of an important figure or a person with unique abilities that the evil force wants to use against the good side. As the story progresses, Lucy could try to escape or even try to turn the rogue to her side by appealing to his better nature.
Well, it could be that Lucy has a misunderstanding. Maybe she overhears something that makes her think Natsu is planning to leave the guild without saying goodbye. So, in a fit of panic and anger, she kidnaps him to get an explanation. Then, as the story progresses, they have a heart - to - heart conversation where the misunderstanding is cleared up. It could also be a situation where Lucy is competing with someone else for Natsu's attention, and she thinks that by kidnapping him, she can have him all to herself for a while and figure out how to make him like her more.
One possible plotline could be that Lucy and Caspian are newly married and the pregnancy is a surprise. They then have to deal with the political implications in Narnia as well as their own personal fears and joys. Another could be that they face some sort of danger during the pregnancy, like an enemy threat that endangers Lucy and the unborn child.
One possible plotline could be that a character is using a hammer and a nail to build a shelter in the forest near Forks. This could be a survival - type story where they have to fend off vampires or werewolves while building. Another could be that the hammer and nail are used to repair a special object that has some significance in the Twilight lore, like a charm or a family heirloom.
One possible plotline could be that Lucy's pregnancy is a result of some magical interference in Narnia. Maybe a powerful spell was cast on her accidentally or as part of an evil plot. And she has to deal with the consequences while also trying to protect Narnia from an upcoming threat.
Well, it could be that Lucy and Laxus are on a mission together. As they face various obstacles, they grow closer. Maybe Lucy gets injured while protecting Laxus, and in a moment of relief and gratitude, Laxus kisses her. After that, they have to deal with the reactions of their guild mates. Some might be happy for them, while others might be a bit skeptical or jealous. Their relationship then develops as they navigate through these reactions and their own new - found feelings.
It could be that Lucy leaves Fairy Tail because of a personal quest she has to undertake. This quest might be related to her family or her past, and she feels that she has to do it alone without the support or interference of the guild. She may plan to return once she has completed this important task.