I'm not aware of any official gay stories about Sora in Kingdom Hearts that involve something called 'Tentacle Kingdom Hearts'. Kingdom Hearts is mainly a story about friendship, light, and dark, and while there are diverse interpretations among fans, this seems rather unorthodox and not part of the main narrative.
Often, themes of acceptance are present. In these fanfics, Sora may have to come to terms with his feelings for another male character associated with the darkness. There might also be themes of sacrifice, where Sora has to choose between his relationship and his duty to save the Kingdom Hearts world. Another common theme could be the exploration of the unknown, as a gay relationship in this context is not part of the original game's story, so the fanfic writers are delving into uncharted territory.
There might be some out there. You could try searching on fanfic websites like Archive of Our Own. However, the availability and quality can vary greatly.
There might be some very niche fan - made works that could potentially touch on such a concept, but it's not something that is widely known or part of the general fan - made content for Kingdom Hearts. Most fan - made stories about Sora tend to focus on his relationships with other main characters in more traditional ways, like his friendship with Riku or his love for Kairi.
First off, think about what kind of story you want to tell in the Kingdom Hearts universe. Maybe it's a new adventure for the main characters or a side story about a minor character. Make sure your writing style matches the tone of the original series and keep the magic and fantasy alive throughout.
It might be seen as a fanfic because it combines elements from various Disney and Square Enix franchises in an unconventional way, appealing to fans' imaginations and creative reinterpretations.
Another area of advanced theory could be related to the connections between different worlds in the Kingdom Hearts universe. In fanfic, authors might postulate new ways that worlds interact, such as hidden portals or a shared energy source that links all the worlds together. This could lead to interesting plotlines where characters discover these new connections and use them to their advantage.
Advanced theory in Kingdom Hearts fanfic gives fans a chance to expand on the existing lore. It allows them to take the concepts from the games and build on them in creative ways. For instance, if the official story only briefly mentions a certain magic spell, fanfic writers can develop an entire theory around it, like how it could be used to traverse between different dimensions.
A Kingdom Hearts fanfic might be considered cumbersome if it has overly complex plotlines. For example, if the author tries to incorporate too many characters from different parts of the Kingdom Hearts universe all at once, it can become confusing. Also, if the writing style is overly wordy and filled with long, convoluted descriptions that don't really add to the story, it can make the fanfic cumbersome.