A sense of loyalty is often a theme. In these fanfics, Shinra and Tamaki are shown to be loyal to each other. Whether it's facing external threats or internal doubts in their relationship, they stand by one another. And the theme of shared dreams can also be found, like they might have a common goal for the future.
I like the fanfic 'Shinra and Tamaki: A New Beginning'. In this one, it starts with a new situation for both of them. It explores their feelings in a fresh way, like how Shinra first realizes his deeper feelings for Tamaki and how Tamaki responds to his newfound affection.
Another plot could involve Tamaki getting injured during a fight. Shinra then takes it upon himself to take care of her. As he nurses her back to health, they have a lot of time to talk and get to know each other on a more personal level. This could lead to them realizing that they have a lot more in common than they initially thought, and their relationship could grow from there.
In a fanfic, their relationship could also develop through moments of vulnerability. Let's say Shinra has a nightmare about his past and Tamaki is there to comfort him. Or Tamaki has a moment of self - doubt about her abilities, and Shinra gives her an encouraging speech. These moments of showing their true selves and being there for each other can deepen their connection. It's about creating situations where they can be honest with each other and build an emotional bond.
Often, there are plotlines where they have to deal with misunderstandings between them. For instance, Arthur might misinterpret Shinra's actions, leading to a rift in their relationship that they then have to repair. There are also plotlines where they are pitted against a common enemy that forces them to work closely together and understand each other better, strengthening their bond.
Friendship is a very common theme. It shows how these three characters with different personalities support and grow with each other. Another theme could be rivalry, especially between Tamaki and the twins in a light - hearted way as they compete for attention or status in the host club.
The relationship between Celty and Shinra is complex and interesting in the original work. Fanfiction allows writers to explore it further. Their different natures, Celty being a Dullahan and Shinra a human, create a lot of potential for unique storylines.
One common theme is the exploration of their different social classes. Tamaki is from a wealthy background while Haruhi is more middle - class, and this often creates interesting dynamics in the stories.
I'm not sure if there is specifically a 'tamaki x kyoya mommy kink fanfic' available. Fanfic topics can be very diverse, but this kind of kink - related content might be less common or might not be easily found on mainstream fanfic platforms due to its rather specific and sometimes controversial nature.
A common theme is their bond. Since they are friends in the original story, fanfics often explore how deep that bond can be. It could be a story about loyalty, where they are always there for each other no matter what.