Well, perhaps the baby could be a magical being sent to them for protection. Natsu's brashness and Lucy's nurturing side would both come into play. They'd have to deal with villains who are after the baby. Along the way, they start to see their future together more clearly, like a family, and it deepens their bond not just as friends but as potential partners.
One possible plot could be that Natsu and Lucy accidentally end up taking care of a baby dragon. They struggle at first with things like feeding it and getting it to sleep. But as time goes on, they grow attached and learn a lot about themselves and their relationship in the process.
Well, perhaps in this fanfiction, Natsu calling Lucy 'baby' is a sign of a new level of closeness in their relationship. It could start with Natsu protecting Lucy in a dangerous situation and instinctively calling her 'baby' as he holds her close. This then leads to Lucy being a bit flustered at first but gradually getting used to it and even liking it, and it becomes a special part of their bond.
Well, perhaps the story could start with Lucy finding out she's pregnant. Natsu is initially shocked but then becomes super excited. The pregnancy is filled with little adventures, like Natsu trying to build a perfect nursery using his magic in a rather clumsy way. And when the baby is born, it brings a new sense of hope and family to the whole guild. Everyone pitches in to take care of the baby, and it grows up surrounded by love and magic.
One possible plot could be that Natsu and Lucy go on a really dangerous quest together. During this quest, they face a powerful enemy that separates them from the rest of their guild mates. They have to rely solely on each other for survival. As they struggle through various challenges, they start to realize their true feelings for each other. In a moment of great danger, when it seems all hope is lost, they confess their love and share their first kiss. This could be the start of their relationship in the fanfiction.
One possibility could be that they discover they're having a baby unexpectedly. Natsu might be initially confused but then super excited. Lucy would probably be a bit more practical, thinking about how to raise the baby in the Fairy Tail guild environment. The guild members would be overjoyed and offer all kinds of help, like Happy bringing little gifts for the baby to be.
Perhaps Natsu kidnaps Lucy as a prank that goes wrong. He initially thinks it'll be a funny joke, like taking her away during a guild party just for a bit of chaos. But then things get out of hand. Lucy might be really angry at first, but as they are alone together, they start to have some deep conversations and understand each other better.
One possibility is that the baby is a key to a mystery. Maybe it has some special power or mark, and villains are after it. Natsu and Lucy then take on the role of protectors, using their magic and friendship to keep the baby safe while trying to figure out its origin.
It could be a dark wizard who wants to use the baby's power for his own evil deeds. Maybe the baby has some special magic that the wizard thinks can help him take over the magical world.
Well, one possible plot could be that Lucy has to face the challenges of pregnancy alone after Natsu leaves. She might struggle with financial difficulties and the emotional turmoil of raising a child without the father. She could then find support in her friends in the guild, who help her through the tough times and she eventually becomes a strong, independent mother.
Well, one possible plot could be that after many adventures together, Natsu finally realizes his deep love for Lucy. He might plan a big, romantic proposal during one of their guild parties. Then the wedding could be a grand affair with all their Fairy Tail friends in attendance. They could exchange heartfelt vows, and the whole guild could celebrate their union with lots of food, music and magic.
One possible plot is that in this fanfic world, female Natsu has a special power that only male Lucy can help her control. So they embark on a journey together. Along the way, they face various challenges like battling powerful demons. Their relationship starts as comrades but gradually develops into a deeper bond as they understand each other more.