Yes, there are quite a few out there. You can start by looking on popular fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'natsu and wendy married' in their search bars, and you'll likely find some interesting stories. However, the quality can vary greatly, so be prepared to do some sifting through different works.
A prevalent theme in 'natsu and wendy married fanfiction' is the exploration of their emotional connection on a deeper level. Since they are now married, the stories might focus on how their love has evolved from friendship or camaraderie. There could also be themes related to cultural or magical elements specific to their fictional universe and how these play into their married life, such as using their magic in unique ways to create a home or protect their relationship.
One challenge could be their different personalities. Natsu is bold and impulsive while Wendy is more shy and gentle. This might lead to some small misunderstandings in their daily life. For example, Natsu might rush into decisions without consulting Wendy.
One possible plot could be that they grow up and as they've been through many adventures together, they realize their feelings have deepened into love. They might face some opposition from the guild at first, thinking they are too young or it's too sudden. But Natsu, with his determination, proves that his love for Wendy is real and they plan a simple yet heart - warming wedding at the guild hall, surrounded by their friends and family.
Yes, in certain fanfictions Natsu and Wendy are considered siblings. This could be due to various reasons. Maybe the author wants to explore a different family dynamic within the Fairy Tail world. It can add an interesting layer to their relationship, like how they support each other more like family members would. Also, it might change the way they interact with other guild members as well.
Wendy would probably be surprised at first. After all, Natsu's greetings are often unexpected. But then she would be really happy, with a big smile on her face. She might blush a little too, since it's such a special and personal greeting from Natsu.
Well, it depends on your taste. Some 'natsu and wendy kiss fanfiction' might be more action - packed with the kiss being a part of a big adventure or rescue scene. While others could be more centered around the emotional growth of the characters towards each other which eventually results in a kiss. It's best to explore different fanfiction platforms and read the summaries to find the ones that appeal to you.
In some Fairy Tail fanfictions, Natsu and Wendy might be depicted in a romantic relationship. However, this isn't a common or canon relationship in the original Fairy Tail series. Fanfiction writers often explore different pairings for creative and imaginative purposes.
I can't really say for sure as I don't actively read lemon fanfictions. But generally, in any fanfiction about two characters, themes like their relationship development might be there. Maybe how they support each other in different situations in a more romantic or intimate context in the case of lemon fanfictions. However, this is all speculation.