In many Cornelia x Guilford fanfictions, sacrifice is a theme. They might have to sacrifice their own desires or safety for the sake of the other or for a greater good. This adds depth to their relationship and makes the story more engaging. Also, the theme of redemption can be present if one of the characters has made a mistake in the past and is trying to make up for it in the context of their relationship.
Well, I'm not sure which specific Cornelia and Guilford you are referring to. But generally, you can try fanfiction.net as well. Sometimes, authors post their works there. Look for tags related to the characters' names. You might also want to check out some dedicated fandom forums where fans might share their favorite fanfictions about this pair.
It can start with showing their professional relationship. They are comrades in Code Geass, so the fanfic could depict how they respect each other's skills in battle and in strategy. Then, gradually introduce personal moments, like when Guilford saves Cornelia from a dangerous situation and she starts to see him in a different light.
One idea could be a story where Cornelia and Guilford have to go undercover in an enemy territory. They would have to rely on each other more than ever, facing challenges that test their loyalty and their relationship. Maybe they discover a secret plot that could change the course of the war in Code Geass.
You can try fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. Just search for 'Will X Cornelia' on their search bars and see what comes up.
One possible plotline could be a romantic adventure where Will and Cornelia go on a quest together. They might face various challenges that test their relationship and their individual strengths.
In lemon fanfiction involving Lelouch and Cornelia, it often explores their complex relationship in unique ways. Writers might play with their personalities and the power dynamics between them. For example, they could be in a situation where they have to work together despite their differences, which adds an interesting layer to their interactions. It also might involve some form of character development for both of them as they face new challenges and emotions within the context of the fan - created story.
For the OC, start by defining their backstory. Where are they from? What experiences have shaped them? If they are from a lower - class area in Britannia, they might have a different perspective on the empire compared to Cornelia. Then, think about their goals. Are they seeking revenge, justice, or something else? As for Cornelia, explore her loyalty to Britannia deeper. Show her internal conflicts, like her doubts about some of Britannia's actions. Also, in their interactions, let their characters evolve. For example, if the OC challenges Cornelia's beliefs, she could start to question herself more, and the OC could learn to be more diplomatic from Cornelia.
One interesting plot idea could be that the OC is a hidden rebel within the Britannian forces. They initially cross paths with Cornelia during a battle, and the OC's unique abilities catch Cornelia's attention. As the story progresses, they start to understand each other's motives better, despite being on opposite sides. Maybe the OC has a secret power related to mind - reading which helps them anticipate Cornelia's moves, and this leads to a series of tense encounters that gradually turn into a strange sort of respect and eventually something more.
Realistically, their relationship could start from a place of mutual enmity. Since they are on opposite sides in the original story, any development would require a significant shift in circumstances. For example, if they are both betrayed by someone within Britannia, they might find common ground in seeking revenge or justice.