He Feels Like Summer || Kagehina AU

WARNINGS: Eventual Character Death, Mentions of Terminal illness but nothing too in-depth. Occasional low moods/bad thoughts on Kageyama's part. (I'll add more warnings if necessary.)
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Kageyama was used to the cold, literally and figuratively. Cold stares from strangers, the cold air that inhabited his home, the cold that manifested itself within him after the years he became known as the dictator king, among many other things. So it's needless to say that he was unprepared when summer arrived, warming him slowly and surely, turning the greys he was so used to seeing into warm, happy colours.

But was he prepared for the day when summer would turn to autumn, before fading away completely?