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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?
Keith has confusing feelings for Lance. He can't pinpoint what they are.
All he knows is that he isn't satisfied with their rivalry and Lance denying their bonding moment hurts.
Before he knew it, he began to cough up petals.
(Hanahaki is a disease which involves coughing up flowers because of unrequited love.)