Perhaps in this fanfiction, a magical spell goes wrong and creates a baby that has a connection to both Natsu and Ultear. They then have to deal with the consequences. Natsu might try to use his fire magic to keep the baby warm in a rather clumsy way at first. Ultear, on the other hand, uses her time - related magic to create things for the baby like a cozy crib or toys. They face challenges like getting the baby to sleep through the night and protecting it from any villains who might want to use the baby for their own evil purposes.
Well, perhaps in the fanfiction, Natsu and Ultear get married in a grand ceremony attended by all their friends from the guild. After marriage, they decide to go on adventures together. Ultear could use her time - magic to help Natsu in battles, like rewinding time a bit to give him an edge. They also start a family, with Natsu teaching their kids about the importance of friendship and Ultear teaching them magic.
The main characters would be Natsu and Ultear. Natsu is a hot - headed and powerful wizard with his unique fire - based magic. Ultear is a more complex character, with her time - magic abilities. In the context of a baby fanfiction, they are the ones who will be taking care of the baby, so they are central to the story.
I'm not sure specifically as I haven't read this particular fanfiction. However, it might involve a fictional scenario where Natsu and Ultear's relationship takes a turn towards having a family, with all the emotional and story - driven elements that come with it like how they deal with the pregnancy, how it affects their relationships with others in the story's universe.
Well, perhaps the pregnancy could be part of a prophecy. This would make them targets for both good and bad forces. They'd have to journey to find out more about the prophecy and how their baby fits into it. Along the way, they'd face challenges that test their relationship and their resolve to protect their family.
The plot might involve Natsu and Mirajane finding a baby dragon in the form of a human baby. Since Natsu has a connection with dragons, he feels a special bond. Mirajane, with her kind heart, steps in to help raise it. They face challenges like protecting the baby from dark guilds who might want to use the baby's power.
One possible plot is that a time - travel or alternate - reality situation occurs where Natsu and Erza are already married and have a baby. The story could show how they adjust to this new family life. Natsu might be the fun - loving dad who plays with the baby using his fire powers in a safe way, while Erza is the strict but loving mom who makes sure the baby is well - behaved and learns proper values. They would also have to deal with the reactions of their friends in the guild, some of whom might be shocked or overly excited about the new addition to their family.
Perhaps characters like Gray or Erza from Natsu's side could be part of the story. They might initially be shocked but then come around to support their friend. On Ultear's side, any of her former comrades or mentors could show up. They could have different reactions, some might be happy for her while others could see it as a threat to their own plans or to Ultear's future in a more negative way.
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.
One possible plot could be that the magic in the world goes haywire. Natsu is caught in a spell that turns him into a baby. His friends in Fairy Tail are shocked at first. Lucy might take on the role of a caretaker, trying to figure out how to reverse the spell while also dealing with a baby Natsu's unpredictable behavior like randomly using small bursts of fire magic that are more like cute little puffs now.
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.