It's All So Pretty [Satsuki] (Chromesthesia AU)

Whenever Sayori heard any sort of music, she'd see little flickers of color. Different notes had a different color assigned to it. Deeper chords had cooler, darker colors while higher notes were warmer and brighter. Sayori learned how to play the Ukulele in middle school and she would write music just so she could see the colors. She would sing songs to help her cope with her depression. When she was bored at school, she would color a paper with crayons to showcase what notes she wanted to play in song. She would transfer sheet music into colors so she knew what notes to play. It was her own little secret that nobody needed to know about. She wasn't too good anyways.
But what Happens when her best friend, and crush, Natsuki find out?