Edit: excuse me, why did the image order change when I posted. Now I have fixed it, but I am disgruntled
This is my drawing of Rengiyuu as Prince Lindworm, a Danish fairytale :)
In the Scandanavian version of King Lindworm, a childless queen is told to eat a rose, either red or white. She eats both roses, and gives birth to twins: the Lindworm (the elder), and a human boy.
When it comes time for the boy to marry, the Lindworm demands he get a wife first, as he is the elder son. In the story, none of the maidens like the Lindworm, so he eats them.
The crone who told the queen to eat one rose speaks to the farmer's daughter, who then comes to meet the Lindworm wearing every dress she owns (yes, you read that correctly). The Lindworm demands she take off the dresses, and she agrees on the condition that he shed a layer of skin for every dress she takes off.
Eventually, the Lindworm sheds all his skins, revealing that he is human, and they marry.
It's kind of Kyoujurou's whole thing, that all life is to be valued, and I don't necessarily like that the happy ending is the Lindworm turning human, so I imagine their story would be different, but the idea is there and I just love dragons.