The Hanahaki Disease is an illness born from unrequited love, where the persons throat will fill up with flower, they will then proceed to throw, and cough up the petals, (sometimes even the flowers). One of the only ways for the disease to 'disappear' is if, the said person returns the feeling (it can't be resolved with friendship, it has to be genuine feelings of love). The infection can also be removed through surgery, though the feelings disappear along with the petals. If they choose nether options, or the feeling is not returned in time, then the patient's lungs will fill up with flowers, and will eventually suffocate. Iwaizumi has loved Tooru oikawa for years, Since they first middle school to be exact. Oikawa was and still is, his first crush. Pushing his own feelings aside for his best friend he ended up developing hanahaki disease Iwaoi angst/ hanahaki AU COMPLETED!