One interesting twist could be that someone from their past or future tries to manipulate the pregnancy for their own gain. This person could be trying to change the course of history through the baby. Lucy and Wyatt would then have to fight to protect their unborn child and the future.
One idea could be that Lucy and Wyatt find out they're having a baby with special time - traveling abilities. It could add a whole new dimension to their adventures as they try to protect the baby from those who might want to use its powers.
Perhaps in the fanfiction, they kiss at a grand ball. Lucy is dressed in a beautiful gown and Wyatt can't resist her charm. It's a very romantic and fairytale - like moment. They might be surrounded by other characters who are either shocked or happy for them.
One possible plot twist could be that Natsu initially doesn't believe it's his child. Maybe he has some self - doubts due to his past or his own insecurities. Another twist could be that there are external forces trying to harm Lucy because of her pregnancy, like dark guilds seeing it as a way to get to Natsu. And perhaps the pregnancy could also bring out a new side of Natsu, a more protective and responsible side that no one has seen before.
One idea could be that Lucy's pregnancy is unexpected and she has to deal with the reactions of her friends and family. Some might be overjoyed while others are worried. Another could be a story where the father of the baby is a mystery and Lucy goes on a journey to find out who it is. Maybe she discovers some secrets about her past relationships along the way.
A possible story could be that they planned for the pregnancy. They've been through so much together in their adventures that they feel ready to start a family. Their pregnancy journey could be filled with small, sweet moments like Wyatt talking to the baby bump at night, and Lucy writing letters to their future child about their time - traveling experiences.
One interesting plot twist could be that Lucy discovers she has a long - lost relative who tries to break up their marriage because of some old family feud. Another could be that Gray loses his memory shortly after the wedding and forgets he's married to Lucy, leading to a journey of rediscovery. Or perhaps a powerful dark wizard curses their marriage, causing them to experience strange and difficult situations until they find a way to break the curse.
One idea could be that Natsu and Lucy face challenges in their guild duties while being pregnant. They might have to balance protecting the guild and their unborn child. For example, they could go on a mission that seems easy at first but turns out to be more dangerous due to Lucy's condition, and Natsu has to be extra cautious to protect her.
One idea could be that they face challenges in preparing for the baby, like finding a suitable home. Maybe they have to deal with family reactions, both positive and negative. Another could be that during the pregnancy, they discover new things about each other's pasts.
One idea could be that Loke has to quickly adapt to the idea of becoming a father. He might start learning about parenting by reading old books in the Celestial Spirit World. Another could be that Lucy's pregnancy reveals some hidden magical powers related to motherhood in her family's lineage.
One interesting plot twist could be that the pregnancy is a result of some sort of magical or strange One Piece - world - related phenomenon rather than the usual way. Maybe they were exposed to a devil fruit - related effect that caused it. Another could be that they initially keep it a secret from the rest of the crew for various reasons, like fear of how Luffy might react. This secrecy could lead to a lot of comical or tense moments as they try to hide the signs of pregnancy.