One idea could be a story where Eragon and Arya go on a quest together and encounter a magical lemon tree that has special powers. They have to protect the tree from an evil force that wants to use its power for bad.
Love and relationship are very common themes. Since Eragon and Arya have a complex relationship in the original series, fanfictions often explore different aspects of their feelings for each other, whether it's the initial attraction or the development of deeper love over time.
I'm not sure specifically about 'eragon x arya lemon fanfiction'. However, you can start by checking popular fanfiction websites like FanFiction.net or Archive of Our Own. They have a wide variety of fanfictions, but make sure to follow the site's rules and guidelines.
There's a fanfiction called 'Arya and Eragon: A New Adventure' that shows them going on an adventure together outside of the main story events. It's a fun read as it explores their personalities and how they interact with each other in different situations.
If it's a proper 'eragon x arya' fanfiction without the adult - themed 'lemon' aspect, you can expect stories that explore their relationship, perhaps how they grow closer or overcome differences. But if it does have 'lemon' elements, it's likely to contain inappropriate content that goes against the general family - friendly nature of the Eragon series.
One common theme is the struggle for power. Since they are in a world full of magic and different factions vying for control, fanfictions often play with this idea in relation to Eragon and Arya. Also, the theme of friendship is prevalent. They are comrades in a way, and fanfictions develop this aspect further. For example, in some fanfictions, their friendship is what saves them from a great danger.
First, do your research on the original Eragon series to understand the characters of Eragon and Arya well. For the lemon element, you could give it a symbolic meaning. For example, it could represent purity or a new beginning. Then, create an interesting plot that weaves the three together. Maybe start with a simple situation like Eragon giving Arya a lemon as a gift, and then build from there.
Such fanfiction is not acceptable. Fanfiction should focus on exploring different aspects of the characters' personalities, relationships in a non - sexual and respectful way. Creating sexual content about these characters is a form of misusing the source material and may make many fans uncomfortable.
A great theme could be their adventures together in a new land. They could face new challenges, discover ancient magic, and grow as individuals and friends while on this journey.
There might be a fanfiction where Arya teaches Eragon some ancient elven lore. This could lead to a stronger bond between them and new adventures as Eragon uses this knowledge. It could also involve them facing off against an unknown enemy that is threatened by Eragon's new - found knowledge.