Hanahaki Disease

An illness born from one-sided love, where the patient throws up and coughs of flower petals when they suffer one-sided love.
The infection can be removed through surgery, but the feelings permanently disappear along with the petals.
It can only be cured without side effects if the feelings are returned.

credits to NCT Prompts on Twitter for the idea!

PROMPT: Hanahaki Disease AU. Kun wakes up to the scent of lilies on his pillow and
feels his chest burst into blossoms as Sicheng slowly walks away.