In general, 'lemon' fanfictions, which often imply sexual content, are not appropriate for all audiences. They may violate the terms of some platforms and can be considered inappropriate in a more general public or family - friendly context.
One common theme is loyalty. Their loyalty to each other and to their respective duties often plays a big role. They are both committed to their positions in their world, and this loyalty sometimes clashes with their personal relationship.
Many fanfictions also explore their personal growth through their relationship. Kuchiki Byakuya, with his strict and stoic nature, might be softened by Renji's more passionate and impulsive personality. Renji, in turn, could learn discipline and refinement from Byakuya. Their interactions can be a great source of character development in fan - made stories.
One common theme is the exploration of their complex relationship. Given their hierarchical difference in the original story, fanfictions often delve into how they bridge that gap. Another theme could be loyalty. Both characters value loyalty in different ways, and fanfictions might explore how that loyalty plays out in their relationship with each other.
Another theme might be the power dynamics between them. Byakuya is in a position of authority in the original story, and in fanfiction, this power dynamic can be played with in different ways. It could be about how they navigate this power difference in a romantic or more intimate context, with the 'lemon' aspect sometimes adding an extra layer of intensity to these themes.
Often, there could be themes related to the challenges they face, both internally and externally. Internally, they might have to deal with their own emotions and insecurities. Externally, they could face reactions from their friends, family, or the community within the fictional world. Another theme could be the journey of preparing for the new life that is coming, which includes things like making a home suitable for a baby and getting the necessary supplies.
In Renji x Byakuya mpreg fanfiction, a frequent theme is the emotional journey. There's often the aspect of how they both come to terms with the pregnancy. It could also include themes of protection, with Byakuya being protective of Renji during the pregnancy. And sometimes, there are themes related to the reactions of their friends and the community around them to this unusual situation.
One great 'byakuya x renji fanfiction' is 'The Bond Beyond Duty' which explores their complex relationship in a very emotional way. It delves deep into their shared history and how they grow to understand each other on a more personal level.
You can try fanfiction platforms like Archive of Our Own (AO3). There are often many well - written Renji x Byakuya fanfictions there. Just search for the pairing in the search bar and you'll get a list of relevant stories. Some of them might be based on different story arcs or interpretations of their relationship, so you can explore and find the ones that suit your taste.
Well, I can't really point out particular 'byakuya x renji lemon fanfiction' directly. However, you could join relevant fan communities or forums dedicated to the series these characters are from. Fans in those places might be able to share some great fanfiction they've come across. Just keep in mind to follow the rules of the community.