A/n: some definitions before we begin!
Hanahaki Disease (花吐き病 (Japanese); 하나하키병 (Korean); 花吐病 (Chinese)) is a fictional disease in which the victim coughs up flower petals when they suffer from one-sided love.

Yellow tulips: one sided love
Primrose: desperation

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Those flowers always tasted bitter in his mouth, no matter what he'd done to drown out the flavor. The bitter tasting tulips and the scratchiness of the primroses scraping the back of his throat had always hurt. These beautiful flowers, signs of his own affections for someone who would never reciprocate.

It hurt. It had become so hard to breathe. Every time he thought of his love's face, the soft features and his beautiful smile and everything that he could admire and never have-

Covering those thoughts in beautiful, beautiful petals.