Well, family is a big theme. Since Lucy is pregnant with Natsu's child, it's about them starting their own family within the Fairy Tail family. Love and protection are also common. Natsu would likely be very protective of Lucy and the unborn child, showing a deeper side of his love. And sometimes, there's the theme of sacrifice, like Lucy might have to sacrifice some of her adventures for the sake of the baby and Natsu might have to change his carefree ways to be more responsible.
Definitely. The 'lucy pregnant with natsu child' fanfiction often delves into different scenarios. It could show how Natsu adjusts to becoming a father - to - be, which might be quite a journey considering his somewhat impulsive nature. And for Lucy, it could explore her fears and joys during the pregnancy. These fanfictions also give a chance to see how the Fairy Tail world would react to such a big event in their two popular members' lives.
One possibility is that their child inherits Natsu's dragon - slayer magic and Lucy's celestial spirit magic. Maybe the child uses this unique combination to protect Fairy Tail from a new, powerful enemy.
They can develop their relationship by having small, everyday moments. For example, sharing breakfast together as a family, where they talk about their plans for the day. Natsu could show his love for Lucy by being more protective of her and their family in dangerous situations. Also, they could have inside jokes that only their family understands, which would strengthen their bond.
One character that would be interesting to include is Mirajane. She has a motherly and observant nature. She could be the one to nudge Natsu and Lucy in the right direction when it comes to their relationship. For instance, she might arrange for them to go on a mission together that she knows will bring them closer. Laxus could also be in the fanfiction. His powerful presence can create a sense of danger or protection. If there's an outside threat to the guild while Natsu and Lucy are exploring their relationship, Laxus could be at the forefront of defending the guild, which would impact Natsu and Lucy's situation. And don't forget about Cana. She could be the one to create some light - hearted chaos, like daring Natsu and Lucy to do something that ends up bringing them closer, such as a bet that leads to a shared adventure.
As they travel, their bond deepens. They start to rely on each other more. Natsu becomes more protective of Lucy, and Lucy begins to understand Natsu's impulsive nature better.
A Natsu x Lucy pregnant fanfic could be full of heartwarming moments. Think about Natsu being overprotective of Lucy during her pregnancy. He'd probably be a bit clumsy at first, but his love for her would shine through. And Lucy would be the one trying to keep things in order while also dealing with her hormonal changes. It could also add a new dynamic to the Fairy Tail group as a whole.