Another theme could be the idea of self - discovery within the context of the 'Kingdom Hearts' universe. The characters might be coming to terms with their sexual orientation while dealing with the various challenges and adventures in the game world. This can add an extra layer of depth to the characters' development. Also, some fanfics may have themes related to the acceptance or rejection of such relationships within the 'Kingdom Hearts' society, which can create interesting storylines.
I'm sorry, I can't directly recommend specific 'Kingdom Hearts' gay fanfic. However, you can try searching on fanfic platforms like Archive of Our Own (AO3). They have a large collection of fanfictions, and you can use the search filters to look for 'Kingdom Hearts' related ones with the gay theme.
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.
One great fanfic about Roxas and Xion is 'The Bond Beyond'. It beautifully explores their relationship as they struggle with their identities within the Kingdom Hearts world. The author does an amazing job of delving into their emotions and the unique connection they share.
I really like 'Bleach - Kingdom Hearts: A New Alliance'. It has an interesting take on how the powers from both series would mesh. For example, it shows how a character from Bleach might use a Kingdom Hearts - inspired weapon in a creative way. The story also delves into the backstories of some characters more deeply, which adds a lot of depth to the fanfic.