For the Black Knights, a kiss between Lelouch and Kallen could be a source of both celebration and concern. Celebration because it could signify a deeper unity between their two leaders. Concern because it could also introduce a personal element into their military operations that might cloud their judgment or cause internal rifts if not handled properly.
C.C. might view it with a sense of detachment at first. But then she might realize that Lelouch is becoming more attached to Kallen in a way that could potentially change their own relationship. She might start to feel a bit left out or even jealous, as she has been by Lelouch's side for a long time and has her own unique bond with him.
In many fanfictions, their relationship starts from comrades in arms. They are both fighting for the same cause against Britannia. As they face more and more difficult battles together, they start to understand each other better and a deeper bond forms.
In many fanfictions, their relationship often starts from mutual respect. Kallen respects Lelouch's strategic mind, and Lelouch admires Kallen's strength. For example, in some fanfics, they start to rely on each other more during difficult battles, which deepens their bond.
One possible fanfiction could be a post - war scenario. After the chaos and destruction in the Code Geass world, Lelouch and Kallen, having fought side by side, realize their deep connection. They start to rebuild the world together and gradually their friendship turns into love. Eventually, they get married in a small, private ceremony attended by their closest friends and allies. The fanfiction could focus on how they overcome the differences in their backgrounds and the challenges of leading a new world while being in love.
Another scenario could be a goodbye kiss. If Lelouch has to embark on a very dangerous mission where he may not return. Kallen, realizing she may never see him again, impulsively kisses him. It would be a bittersweet moment filled with unspoken words and the weight of their relationship and the situation at large.
It could include their courtship. For example, Lelouch might start to show his softer side to Kallen, and she in turn would be more open about her feelings. They could go on secret dates in the rebuilt areas of the world, away from the prying eyes of the public. The fanfiction might also show how their friends react to their relationship. Some might be supportive, while others might be skeptical at first but then come around.
One popular fanfiction might be 'A New World for Us' which explores their relationship in an alternate universe where the war ends differently. It delves deep into how they interact and support each other in rebuilding their world.
There's also 'The Unspoken Bond'. In this fanfiction, the author delves deep into the unspoken feelings between Kallen and Lelouch. It starts with small, subtle moments between them during the battles and gradually builds up to a more complex relationship. It's a great read for those who love to analyze the characters' emotions.
Kallen might also develop a stronger sense of leadership. In a new time period, she may have to take on different roles and responsibilities. This would force her to grow as a leader. She could learn new strategies and ways of dealing with people, which she could then bring back to her own time to better lead the Black Knights.
Their relationship could develop through shared goals. For instance, if they both aim to overthrow a corrupt regime within Britannia. Working side by side towards this common objective would make them rely on each other, leading to mutual respect and eventually love.
Lelouch's character would likely become more cautious. Knowing the consequences of his past actions through time travel, he might think twice before making rash decisions. For example, he might not be as quick to use his Geass power without considering all the long - term effects.