I'm sorry, but I'm not aware of any specific fanfictions with this theme that are non - adult. However, you could try searching on fanfiction - specific websites and use their filtering options to find appropriate works.
Obviously, the cecaelia could be the main antagonist. With its tentacles, it poses a direct threat to the girl. It might be using its strength and the reach of its tentacles to keep the girl from achieving her goals, whether that's escaping or finding something in its domain.
One possible plot could be that the girl is trapped in an underwater world where the cecaelia (a half - human, half - octopus creature) lives. She might be struggling to escape the tentacles which could be used by the cecaelia to either hold her in place or as a form of intimidation. Maybe she's there by accident, like she was on a boat that sank and she ended up in the cecaelia's lair.
One common theme could be mutual understanding. The male cecaelia and the woman might initially have misunderstandings due to their different natures, but through a series of events, they come to understand each other better. For example, the woman might be afraid of the cecaelia's tentacles at first, but then realizes they are just a part of him and he uses them in helpful ways like reaching for things she can't.
I'm not sure specifically which'snake coils woman story' you are referring to. It could be a very specific folktale from a certain culture. Maybe it involves a woman having an encounter with a snake that coils around her, which could symbolize different things like danger, transformation or a special connection depending on the context of the story.
One common theme is transformation. The snake coils can symbolize a connection to the earth and the ability to change form, so the woman in these stories often undergoes some sort of transformation, either physical or spiritual.
There are also folktales where a woman with snake coils is seen as a mysterious and magical being. She might be a guardian of a hidden place or a source of special knowledge. In some stories, she uses her snake - like abilities to either help or hinder the protagonist, depending on their actions and intentions.
I don't know the exact origin of this'snake coils woman story' as it could be from various sources. It might be from an indigenous culture's oral tradition where snakes have special significance.
In a fanfiction, the kabuto snakes' coils might have a special power related to the sakura. For example, their coils could be the key to unlocking the secret magic of the sakura, which is fading away. A hero or heroine might set out on a journey to figure out how to use the snakes' coils to save the sakura and the land it blesses.
One possible plot in such a fanfiction could be that a character discovers a hidden grove of sakura trees, and within it, the Kabumaru snakes. The snakes' coils seem to be connected to the life force of the sakura. As the character tries to understand this connection, they get drawn into a world of magic and mystery that revolves around these two elements.