This article is cute.
I remember when I first met him, the first thing he said as a chubby child was fairy sister, I want to marry you. Goodbye is already the holy promise made by the family patriarch to protect him for the rest of his life.
It doesn't matter if he is knocked back to his original form by a catastrophe. Since he said he would be protected and someone is there to protect him, even if he loses a lifetime of practice, it will be worth it.