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Newt couldn't help but notice the way Thomas' cough had grown worse, more ragged, and how every now and then, small, delicate petals fell from his lips. At first, Newt thought it was nothing-a cold maybe-but now, as he watches Thomas clutch his chest in pain, he realizes the truth: Hanahaki disease. The flowers that bloom in Thomas' lungs are a cruel manifestation of unspoken love, and the more Thomas tries to hide it, the more they bloom, suffocating him slowly. Newt knows that if Thomas doesn't confess his feelings soon, the flowers will be the death of him. But how can Thomas confess, when the person he loves is Newt?
Hanahaki Disease (花吐き病 (Japanese); 하나하키병 (Korean); 花吐病 (Chinese)) : A disease in which the victim coughs up flower petals when they suffer from one-sided love. It ends when the beloved returns their feelings (romantic love only; strong friendship is not enough), or when the victim dies. It can be cured through surgical removal, but when the infection is removed, the victim's romantic feelings for their love also disappear.