One common theme is the exploration of their different backgrounds. Cyno from the desert and Tighnari from the forest have distinct cultures and ways of life, and fanfictions often explore how they bridge that gap. Another theme is friendship turning into something more. They start as comrades and gradually develop romantic feelings.
There's a really interesting Cyno x Tighnari fanfic called 'Under the Sumeru Moon'. In this story, they are on a mission together to solve a mystery in Sumeru. As they work side by side, their feelings for each other start to grow. It's full of mystery and a bit of action, which makes it very engaging. Also, 'Harmony of Elements' is a fanfic that shows how their elemental powers interact and how that affects their relationship in a unique way.
Sarada comics hentai usually contain sexually explicit or inappropriate depictions of the character. It's not suitable for general audiences and goes against the intended themes of the original Naruto series.
Manga hentai typically focuses on adult and explicit content, while 'corno' is not a common term related to manga. Maybe you mean something else with 'corno'?
Pancake funny comics can be amusing because of the wacky expressions of the characters or the absurd ways pancakes are presented. Also, the creative storylines and dialogues contribute a lot to the fun factor.