Wilboxx
Yes I know it's a rarepair. Hate comments will be removed
TW: BLOOD, VOMITING AND SLIGHT GORE THROUGH THE ENTIRE STORY
Those that catch the disease coughs up flower petals when they suffer from one-sided love. Their lungs get filled with the flowers and their respiratory system grows roots. They choke on their own blood and petals, and die. It can be cured through surgical removal, but when the infection is removed, the victim's romantic feelings for their love also disappear. Sometimes this also removes the victim's ability to ever love again. Another way to be cured of it is for the object of the victim's love returns their affections, thus making the love no longer unrequited.