Twelve Days of Christmas Pear Tree

Origin
In the Twelve Days of Christmas song, the song starts with “On the first day of Christmas my true love sent to me, a partridge in a pear tree”. The next lines are built the previous ones, which are repeated, and the amount of each present successively grows.

Effects
A perpetually blossoming pear tree, whenever someone touches it, their love interest will suddenly express romantic actions towards the person. Every day for twelve days the love interest will invest more and more into their proclamations of love, and cannot be dissuaded otherwise.

Eventually, they'll exhaust themselves to the point of illness, and may die by the end of the twelfth day if it is bad enough. Death can be prevented by the person who touched the tree successfully convincing the love interest that the first does not care at all for the latter on the twelfth day.