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.
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.
One possible fanfiction could be that Natsu and Mavis get married in a simple yet magical ceremony. Their friends from Fairy Tail are all present, and the guild hall is decorated with beautiful flowers. Natsu is nervous but excited, and Mavis looks stunning in her white dress. After the wedding, they embark on a journey together to explore new lands and discover hidden magic, all while growing closer as a married couple.
In this fanfiction, Natsu and Mavis' married future could be one where they build a small cottage near the guild. They have a peaceful life, with Natsu going on occasional guild missions while Mavis stays back to tend to their home and garden. Their days are filled with simple joys like cooking together and sharing stories by the fireplace at night.
Finding specific lemon fanfiction can be a bit tricky and also might not be in line with the community guidelines of many platforms. Instead, you could join some Fairy Tail (assuming that's where Natsu and Wendy are from) fan communities on social media platforms like Reddit or Discord. There, fellow fans might be able to point you in the right direction for some great non - lemon fanfictions about these two characters.
One common theme might be a 'what - if' scenario where Natsu and Wendy have a closer relationship than in the original series. But since 'lemon' implies mature content, it's not really in line with the general Fairy Tail spirit. The original series is more about magic, friendship, and guild loyalty.
One interesting plot could be that Natsu and Wendy travel back in time to the era when dragons were still abundant. They could learn powerful dragon - slaying magic directly from the dragons, which would not only enhance their powers but also give them a deeper understanding of their own abilities and the history of dragon slayers. This could lead to new friendships with the dragons and change the course of future events in their original timeline.