Weird, in this book, the last two poems that determine the end of the tale have two different versions, this is what the newer version of the poem says:
A long, long time ago... there was redemption.
A succubus captured by the foul men, accused of endless sins, but this succubus was actually something else, it was a creature of different wings.
As the princess approached, she immediately saw the succubus' purpose, the succubus wanted to give herself to the princess as the ultimate service.
The beautiful demon wanted to sacrifice, and give her whole beauty and immortality to the princess, for no other being under the blue sky should be more beautiful than her, a true love goddess.