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Castiel lives in a world of colour and sound, endlessly intertwined like two parts of a whole.
As a radio broadcasting student, he runs a small segment on their campus radio program in the evening - and with help from his synaesthesia - tries to make the program more interesting by bringing in a little bit of colour.
Castiel views his synaesthesia as both a gift and a curse, but after a chance encounter with a mysterious, stunning, golden-green voice, he's starting to think that it's more of the former.