It could be the Sage of Six Paths. Since Naruto has the power of the Nine - Tails and is on a path to becoming a great ninja, the Sage might be trying to communicate with him through voices, guiding him to fulfill some greater destiny.
It could be his parents. Minato and Kushina might be trying to communicate with him from the afterlife. They could be sharing family secrets or just giving him words of love and encouragement.
In this kind of fanfiction, the plot could be that Naruto starts hearing voices due to some dark jutsu used against him. Maybe these voices are from his past enemies, like Orochimaru, whispering in his mind, trying to break his spirit. And Naruto has to struggle to overcome these voices and not let them influence his actions.
Well, it could be that Naruto starts hearing the voices of past Hokages. Maybe they're guiding him in some secret mission or giving him advice on how to deal with new threats in the village. For example, the First Hokage's voice might tell him about ancient sealing techniques to use against a powerful enemy.
Another theme is growth. Naruto's discovery of Sakura's thoughts can lead to his own personal growth. He might become more understanding or empathetic. In some fanfictions, after hearing Sakura, Naruto starts to see her in a new light and tries to be a better friend or potential partner. He might work on his own flaws, like his impulsiveness, in order to be more worthy of her feelings.
One popular 'naruto hears sakura fanfiction' is 'A Moment of Understanding'. In this fic, Naruto overhears Sakura's true feelings about their friendship and it changes their dynamic in an interesting way.
Well, if it contains sexual elements as the name implies, it is likely not appropriate for a wide audience. Fanfiction is supposed to be a form of creative writing, but when it delves into sexual content, it can make some readers uncomfortable and may not be suitable for all ages or settings.
Since I'm not familiar with 'kingdom hears', it's difficult to say what this fanfiction might entail. It could potentially be some sort of fictional exploration within a made - up 'kingdom' setting with romantic or sexual elements, but without more context, it's just speculation.
Here are some sentences describing sounds:
Her voice was as clear and pleasant as the chirping of birds in the morning.
2's voice carried a deep sadness that was irresistible.
The voice contained a powerful force that attracted people involuntarily.
Her voice was as gentle as the spring breeze, making people feel endless warmth.
The voice was as loud as the surging waves, making people feel the passion of life.
His voice was hoarse like an old man's sigh, making people feel the vicissitudes of time.
The melodious sound of the song was like classical music, making people feel the charm of culture.
8's voice was as loud as firecrackers in the night sky, making people feel passion and hope.
Her voice was as sharp as an elf's singing, making people feel the purity of their souls.
10's voice was as gentle as a drizzle, making people feel warm and harmonious.