You had a disease called hanahaki and the only way to cure this was to confess to their crush or remove the flower that grows in your lungs which was even more riskier. Though if your crush loves someone else than you, you’d throw up your favorite flowers. You, had a crush on Draco Malfoy but he doesn’t seem to really like you… So if your crush doesn’t like you back, you’d throw up the flowers and blood