One possible interpretation could be that the color flushing her cheek is a sign of embarrassment or attraction. When the narrator tilts their head, it might be a sign of curiosity or interest. In fanfics, these small details often add depth to the relationship between the characters.
It could mean that there is a moment of connection between the two characters. The flushed cheek might indicate that the female character (assuming so) is having an emotional reaction, and the narrator's head - tilting shows that they are observing and perhaps feeling something too.
One great 'Muichiro x Reader' fanfiction is 'A Meeting in the Mist'. It beautifully captures Muichiro's somewhat aloof nature while gradually developing a sweet relationship with the reader. The descriptive language used really makes you feel like you're in the Demon Slayer world with them.
In a short story, the Scarlatti Tilt could be related to the musicality of the writing. Scarlatti is known for his music, and perhaps the tilt is a rhythmic or tonal change in the story. It could be that the language becomes more staccato or the pacing changes suddenly, mimicking the style of Scarlatti's compositions. This can create a unique atmosphere and engage the reader on a different level.
The Scarlatti Tilt can be very significant in a short story. It often serves as a turning point. Just as in music, a change in tempo or key can catch the listener's attention, in a story, this tilt can grab the reader's focus. It might be the moment when the protagonist's fate is sealed or when the underlying theme becomes clear.