Another plot could be that there is some sort of magic-related complication with the pregnancy. This leads them on a journey to find a way to ensure the health of the baby. Along the way, they learn more about their own relationship and grow closer as a couple, all while facing the unknowns of the magical complication.
One idea could be that they discover the pregnancy during a big battle. The news gives them extra motivation to protect their world and each other. They start to prepare for the baby's arrival while still dealing with the threats around them.
Maybe they struggle at first because they are both so used to being in the thick of the action. But as the pregnancy progresses, they find new joys in the simple things like decorating a nursery. Their friends also rally around them, offering different kinds of support which creates a heartwarming story.
A plot could be that during a difficult mission, Mirajane discovers she's pregnant. Natsu then has to balance protecting her and completing the mission. This would add a layer of tension and emotion to the story.
One plot idea could be that Natsu accidentally discovers Mirajane's secret hobby, like painting. As he tries to help her show her work, they grow closer. Another could be a mission where they get separated from the rest of the guild and have to rely on each other for survival, leading to a realization of their feelings. Or perhaps a magic - induced amnesia situation where Natsu forgets everyone but Mirajane is determined to make him remember their relationship.
One idea could be that they discover their pregnancy during an important mission. This would add a layer of complexity as they have to balance their new situation with their duties. They might have to face the reactions of their friends in the guild, some being overjoyed and others worried. Another plot could involve them preparing for the baby's arrival, like Natsu trying to build a nursery with his unique brand of enthusiasm but making comical mistakes along the way.
One idea could be focusing on how their guild mates react. Maybe there could be a big celebration in the guild hall, with everyone bringing gifts and sharing their excitement. Another plot could revolve around their preparations for the baby, like choosing a name or decorating the nursery.
One idea could be that Natsu and Mirajane start a family in a peaceful post - guild - war era. Their kids inherit unique magical abilities from both of them and they have to train and guide their children through the magical world's challenges.
Well, a great plot could involve them facing some challenges during the pregnancy. For instance, Mirajane might have some difficulties with her magic due to the pregnancy hormones. And Laxus would be super protective, which could lead to some interesting conflicts within the guild when he overreacts to perceived threats. Also, they could discover some old family traditions related to pregnancy and childbirth that they decide to incorporate.
One idea could be focusing on how her pregnancy affects her relationships within the guild. Maybe she becomes more protective and nurturing towards the younger members. Another could be about the challenges she faces in balancing her pregnancy with her duties as a mage. For example, she might have to take a break from dangerous missions but still find ways to contribute to the guild's well - being.
Maybe the story could revolve around how their guild mates react to the news. Some might be overly excited and start planning big parties, while others could be more cautious and offer practical help, like setting up nurseries for them. It would show the strong community within the guild.
The plot could involve the entire Fairy Tail guild being involved in their pregnancy journey. For example, Levy could be helping Mirajane with researching about any magical implications of a half - dragon (assuming Natsu's dragon side has an impact) and half - demon (Mirajane's side) baby. Erza might be training Natsu to be more responsible and gentle. And as the due date approaches, the guild could be preparing a grand celebration for the new arrival while also ensuring the safety of Mirajane and the unborn child from any potential threats.
There might be a fanfiction where the pregnancy is a surprise to both. For example, in a story called 'Unexpected Miracles', it could start with Mirajane realizing she's pregnant and then Natsu's reaction being a mix of shock and joy. They then have to deal with the challenges of impending parenthood in a world full of magic and danger.