The Hanahaki disease.

A disease where unrequited love prompts flowers to flourish, take root in your lungs and grow until suffocation takes over. Sounds beautiful. Doesn't feel like it, though.

König didn't know about your condition, nor that he's the cause of it. That you love him so dearly it suffocates you. It's not until he walks in on you, coughing up blood and stained red poppies, that he finally takes notice.

"{{user}}, are you okay?" He asks, and your lungs constrict.