It's quite possible that there is such a fanfiction. Fanfiction thrives on exploring different relationships and storylines that may not be part of the original canon. Given the popularity of the characters Lucy and Sting, some fans might have been inspired to write a story where Lucy is pregnant with Sting's child. You could also try reaching out to fellow fans on social media platforms dedicated to the relevant fandom to ask if they've come across such a fanfiction.
The pregnancy in the fanfiction can be a turning point in their relationship. They'll have to face new responsibilities together. Sting might become more serious and responsible, which Lucy will appreciate. And Lucy's vulnerability during pregnancy will make Sting more protective. They'll also have to make sacrifices for each other and the baby. For instance, they might have to cut down on their individual adventures to focus on their family, which will show their commitment to each other and the new life they're bringing into the world.
Well, a plot could revolve around Sting being overly protective of Lucy during her pregnancy. He might try to keep her from going on any dangerous missions, which could lead to some cute arguments between them. Then there's the idea of them preparing a nursery together. They could have different ideas about how it should look, like Sting wanting it to be all about Sabertooth's colors and Lucy having a more whimsical design in mind. And of course, there could be a plot where they discover that their baby has some special magic abilities even before it's born.
Lucy might become more protective and maternal. Since she has always been kind - hearted, her pregnancy could enhance her nurturing side. She would likely be more cautious about getting involved in dangerous battles and focus more on the safety of her unborn child. Sting, on the other hand, might become more responsible. As a dragon slayer, he is used to being carefree, but with a baby on the way, he would start thinking more about the future and providing for his family.
One plot idea could be that Lucy and Sting discover they are pregnant around the same time. They could then support each other through the various challenges of pregnancy in a magical world. Maybe they have to deal with magical side - effects on their unborn children due to their own powerful magic.
One common theme is friendship. Many fanfictions explore how Lucy and Sting become friends and support each other. For instance, they might help each other out in battles or deal with personal problems.
One common theme is friendship development. They often start as acquaintances or even rivals and then become close friends. For example, in many fanfictions, Sting initially sees Lucy as just another mage but as they interact more, they find mutual respect.
There could be many different fanfictions with Lucy and Sting having a pregnancy plot. However, it really depends on the creativity of the fanfiction writer. Some might write it as a way to develop their relationship further, perhaps adding more drama and complexity to their story.
It might include the reactions of their friends and comrades. For example, how Natsu or the other Fairy Tail members would respond to this unexpected situation. It could also explore the relationship between Lucy and Sting as they prepare for the arrival of the child, like dealing with the responsibilities and their feelings for each other.
Often, love and relationship development is a big theme. It might show how their relationship evolves with the addition of a baby. Also, there could be themes of protection. Lucy and Sting protecting their baby from various threats in the fictional world they are in. This could be threats from villains or just the general challenges of raising a child in that world.