Well, perhaps Natsu could be sparring with Lucy and accidentally land a more powerful blow than he intended during a training session. Maybe he's in his dragon force mode and loses control for a second, hitting Lucy hard enough to make her fall and get injured.
Well, it could start with Natsu and Lucy realizing what has happened. Natsu, being his impulsive self, might have some wild ideas about how to handle it. But as time goes on, he would start to understand the seriousness. Lucy would likely be the more practical one, thinking about things like preparing for the baby's arrival. Their relationship could become strained as they deal with the unexpected situation, but also grow stronger as they face it together.
The story might start with the discovery of the pregnancy. Natsu would be full of mixed emotions, ranging from fear to a strange kind of excitement. Lucy would be more focused on the practicalities right away. As time passes, they would have to deal with things like baby names, buying baby clothes, and getting ready for the new addition to their family. Their friends in the guild would be involved too, some offering to babysit in the future, others giving them tips on how to raise a strong and magical child. The story would be a mix of the joys and difficulties of an unexpected pregnancy in a magical world.
They can develop their relationship by having small, everyday moments. For example, sharing breakfast together as a family, where they talk about their plans for the day. Natsu could show his love for Lucy by being more protective of her and their family in dangerous situations. Also, they could have inside jokes that only their family understands, which would strengthen their bond.
One character that would be interesting to include is Mirajane. She has a motherly and observant nature. She could be the one to nudge Natsu and Lucy in the right direction when it comes to their relationship. For instance, she might arrange for them to go on a mission together that she knows will bring them closer. Laxus could also be in the fanfiction. His powerful presence can create a sense of danger or protection. If there's an outside threat to the guild while Natsu and Lucy are exploring their relationship, Laxus could be at the forefront of defending the guild, which would impact Natsu and Lucy's situation. And don't forget about Cana. She could be the one to create some light - hearted chaos, like daring Natsu and Lucy to do something that ends up bringing them closer, such as a bet that leads to a shared adventure.
As they travel, their bond deepens. They start to rely on each other more. Natsu becomes more protective of Lucy, and Lucy begins to understand Natsu's impulsive nature better.
Well, one consequence could be that Draco feels extremely guilty. He might try to make it up to Harry in various ways, like helping him with his studies secretly. In some fanfictions, this accident could also lead to a change in their relationship dynamic, from enemies to something more complex, like reluctant allies.
Well, first of all, Lucy can try to have an open and honest conversation with Lisanna. By expressing her feelings and asking Lisanna why she is acting this way, she might be able to resolve the conflict. If that doesn't work, she can choose to rise above it. She can pour her energy into her magic training, become stronger, and show that she is not going to be brought down by Lisanna's actions. She can also look for new friendships outside of the group that may give her more positive energy and support. Another option is for Lucy to take a break from the situation. She can go on a solo adventure, clear her head, and come back with a new perspective on how to deal with Lisanna.
One common theme could be jealousy. Maybe Sting is jealous of Lucy's relationship with another character and his actions out of jealousy end up hurting her. Another theme might be power struggles. If Sting has more power or is in a position of authority, he could use it in a way that harms Lucy either physically or emotionally.