In a 'natsu gets married fanfiction', perhaps Natsu meets a new character who he falls deeply in love with at first sight. This new person might be from a different land. Natsu has to learn about her culture and traditions in order to marry her. His friends from the guild are initially skeptical but then come to support him wholeheartedly as they see how much he cares for this person.
He could marry an original character created specifically for the fanfiction. This character could be a powerful mage from a far - off place who crosses paths with Natsu during one of his adventures.
It could be that Natsu is part of an experiment in a parallel universe within the fanfiction. The experiment gives him the ability to get pregnant. His journey would involve coming to terms with this new state, facing the challenges of pregnancy, and maybe even finding a way to reverse it if he wishes.
Well, perhaps Natsu is framed for stealing a powerful magical artifact. Someone could plant false evidence at the scene. Then he has to prove his innocence while also dealing with the distrust of his friends.
Well, it could be that Natsu made a big mistake during a mission, like accidentally destroying a precious artifact that was crucial for the guild's future. So the guild master berates him for his carelessness.
In a 'natsu married oc fanfiction', perhaps the OC is a healer. Natsu gets seriously injured during a battle and the OC nurses him back to health. Natsu is so grateful and impressed by her kindness and skill that he starts to develop feelings for her. They get married and the story could focus on how Natsu has to adjust to having a partner who is more calm and collected compared to his fiery self. He might learn to be more patient and she might learn to be more adventurous from him.
The fanfiction could be set in a world where Natsu and Levy are married and they are faced with a great threat to the guild. They work together as a married couple to defend their friends and the guild. Natsu uses his fire - power and Levy uses her script magic in unison. Their love for each other gives them extra strength and they become an inspiration for the younger members of the guild.
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.
In the 'natsu gets cana pregnant fanfiction', perhaps it starts with a magical accident. Natsu and Cana might be exposed to some strange magic that causes an unforeseen bond between them. As a result, Cana discovers she is pregnant. Then, they would have to face the reactions of their friends and the challenges that come with this new situation in their lives.
Well, it could involve a lot of emotional turmoil. Maybe Natsu initially panics but then slowly accepts his new role as a future father. They might face challenges from their friends or guildmates who are surprised by the sudden situation.
One possible plot could be that Apollo marries a mortal. He might meet her in a beautiful garden where she is tending to the flowers. He is immediately smitten by her beauty and kindness. Their relationship could face many challenges, like the wrath of other gods who think Apollo is making a mistake by choosing a mortal. But Apollo's love for her is so strong that he is willing to face any consequences to be with her.