Love and romance are obvious themes. It could explore how their relationship developed from friendship to love. Also, themes of loyalty and support, like how they support each other in difficult times. Maybe there are themes of self - discovery too, as they grow in their relationship and as individuals.
I'm not sure of specific 'natsu and wife bisca' fanfic. You could try searching on popular fanfic websites like Archive of Our Own or FanFiction.net. They usually have a wide range of fanfictions about different characters.
One common theme is adventure. Since Natsu is a very adventurous character in Fairy Tail, fanfictions often incorporate exciting adventures where Natsu and Bisca are together. They might go on quests or fight against powerful enemies side by side.
The contrast between their characters. Natsu is hot - headed and impulsive while Bisca is more level - headed. Their interactions can lead to some really fun and unexpected moments in fanfics.
One interesting aspect could be the unique character interactions. Natsu is a very energetic and passionate character, and Bisca is strong - willed. In a fanfic, their relationship might be explored in new and exciting ways, like how they team up for a difficult mission and develop a deeper bond through shared challenges.
One great natsu x bisca fanfic could be 'A Chance Encounter'. It beautifully weaves a story of how they might interact in different scenarios. It focuses on their individual personalities and how they could complement each other. For example, Natsu's boldness and Bisca's determination are highlighted and brought together in an interesting way.
One possible theme could be friendship. Since both Naruto and Natsu (from Fairy Tail) are known for their strong bonds with their friends, a fanfic could explore how characters from both series form new friendships or strengthen existing ones while on the 'trains' adventure.
You could try looking for other Fairy Tail - related fanfics. For example, those focused on Gray and Juvia's relationship might have a similar feel. Their dynamic is also full of love and some comical moments. Another option could be fanfics about Erza and her adventures, as she is a very popular character in the Fairy Tail series.
One thing that could make it unique is the combination of characters. Natsu and Bisca are both interesting characters with their own personalities. Their relationship in the fanfiction might explore aspects that are not shown in the original series. For example, their interactions could be more intimate and emotional, which gives a new perspective on their characters.
In non - lemon fanfictions, their relationship is often one of comradeship. Natsu is known for his fiery and friendly nature, and Bisca is a strong - willed and capable mage. They might interact as fellow guild members, going on adventures together, or helping each other out in battles. For example, they could be part of a team in a mission where Natsu's strength and Bisca's marksmanship combine to defeat the enemy.
I'm sorry, but I can't recommend lemon fanfictions as they often contain inappropriate or adult - themed content. However, you can try looking for general Natsu and Bisca fanfictions on popular fanfiction websites like FanFiction.net or Archive of Our Own.