Not having read a 'Jon Snow fostered lemon fanfiction', we can only hypothesize. It might be that Jon Snow, while being fostered in some new place or by someone new, gets involved in a situation that is both challenging and has a touch of the 'lemon' nature. This could potentially mean that there are some spicy or tense moments in the story, perhaps related to a love interest or a power struggle that has a unique twist due to his fostered status. However, this is all speculation as the specific fanfiction doesn't seem to be a common one that is widely known.
I'm sorry, but I'm not aware of any specific 'Jon Snow fostered lemon fanfiction'. Fanfiction can be quite diverse and spread across many platforms, and it might be difficult to specifically point out ones with this rather unique concept.
If Jon Snow were fostered at Casterly Rock in fanfiction, it would be a very different story from what we know in the original series. He would grow up in a more opulent and cut - throat environment. The Lannisters' values are different from those he was raised with in the North. This could lead to a conflict within himself as he tries to reconcile his Stark upbringing with the Lannister way of life. He may also discover secrets about the Lannisters that could change the course of his future and the future of Westeros.
A plot could be that Lemon is a spirit in the form of a human. Jon Snow and Sansa are on a spiritual journey and they cross paths with Lemon. Lemon has the ability to see into the future and warns them of a great danger approaching their homeland. They then set out to find a way to prevent this disaster, with each character bringing their own strengths - Jon's leadership, Sansa's intelligence, and Lemon's prophetic abilities.
It would make him more cunning. Growing up among the Lannisters would force him to be on his guard all the time and develop ways to outwit his opponents.
One common theme that can be made appropriate is his loyalty. This can be explored in a non - adult way, such as his loyalty to the Night's Watch or his family. For example, a fanfiction could focus on how his loyalty is tested when faced with difficult decisions regarding his Stark heritage and his vows to the Watch.
Themes could include adventure and discovery. Maybe they embark on a journey together and during that, their relationship develops. There could also be a theme of redemption. If either character has made mistakes or has a troubled past, their relationship could be a means of finding redemption. Additionally, loyalty might be a theme, as they might have to be loyal to each other in the face of various challenges in the fanfiction world.
One common theme could be the complex relationships among the characters in the harem. Each character might have a different connection to Jon Snow, be it love, loyalty, or something more complicated.
Love and romance are very common themes. Writers often explore how Jon and Val might fall in love, considering their different backgrounds and personalities. Another theme could be redemption. Maybe Jon has to make up for something he did wrong in the past, and Val helps him through it. There are also themes related to power and leadership, as both characters can be associated with some form of authority in different ways.
One common theme could be the exploration of family ties. Given that Lyanna Stark is Jon Snow's mother, some fanfictions might play around with how this relationship affects the story. Another theme could be love and passion, which is where the 'lemon' aspect might come in, showing the deep emotional and physical connection between the characters.
In a lemon fanfiction, there could be a lot of emotional and physical chemistry between them. Jon's rough exterior from his time in the Night's Watch and Margaery's soft yet strong - willed nature could create a really intense relationship. They might share secrets and dreams that no one else knows, and this new - found closeness could be the start of a journey that changes the fate of Westeros.