A fanfiction could focus on Sakura and Syaoran's daily life after the main events of Cardcaptor Sakura. Maybe they are training new cardcaptors. They could be facing challenges like how to teach the newbies about the importance of the cards and the right way to use their magic, all while their relationship continues to develop in this new phase of their lives.
It depends on how it's written, but generally, it doesn't seem appropriate. Cardcaptor Sakura is a story that is centered around positive values like friendship and courage. A 'diaper fanfic' might involve elements that are not in line with these values or are simply too odd and not suitable for the mainstream audience that the original series targets. If it's just a silly, innocent take on the characters in a different situation, it might be okay for a very small and specific group, but overall it's not a typical or appropriate addition to the Cardcaptor Sakura fan works.
One great fanfiction could be 'Syaoran and Sakura's Unseen Adventures'. It might explore their relationship further after the events of the original series, like how they deal with new magical threats together. Another one could be 'Sakura's Heart, Syaoran's Love' which might focus on the emotional depth of their connection, perhaps with Syaoran expressing his love for Sakura in new and different ways. And 'The Magical Bond of Syaoran and Sakura' could show their bond growing even stronger as they face challenges that test not only their magic but also their relationship.
When writing a Cardcaptor Sakura sister fanfiction, it's important to keep the magical elements consistent with the original. For example, if you introduce new cards, they should fit within the existing magic system. Also, explore the emotions between the sisters. Maybe there's some jealousy or admiration that can be developed into a great story. You can start with a simple idea, like the sister accidentally getting involved in one of Sakura's card - capturing missions and then build on that.
The 'Cardcaptor Sakura' love story mainly revolves around Sakura's growth and her budding feelings. Sakura has a crush on Yukito, which is a sweet and innocent part of the story. As she continues her journey to capture the Clow Cards, her relationships develop and change. She also has a special bond with Syaoran, which evolves into a more complex and affectionate connection over time.
A fanfiction could focus on the everyday adventures of Touya and Yukito. For example, they could go on a simple trip together. During this trip, they might encounter some minor magical occurrences that are not directly related to Sakura's card -capturing. It could be a story about their friendship growing stronger through shared experiences and how they support each other in different situations.
Most 'Cardcaptor Sakura' yuri fanfics often focus on the strong female friendships in the original series and develop them into romantic relationships. They usually maintain the magical and whimsical atmosphere of the show.
There are fanfics that explore the relationships between the characters in more depth. For example, a fanfic might expand on the friendship between Sakura and Tomoyo. It could show more of their daily interactions and how Tomoyo's support is even more crucial in different situations that are not shown in the original series.