i'm looking for a yaoi manga in which the uke is the demon king, the seme is a younger demon who always admired the king.

the demon king got some kind of sickness, and the seme was a doctor's assistant, so they met. the seme's wings were only of bones, every other demon pushed him aside for being like that, but the demon king didn't.

eventually the doctors abandoned the king, leaving him to die, but the seme saved him and happy end, kinda.

i can't remember more about it beside that it's a bittersweet romance story, and that the king had long hair and he was nicely built, the seme was meek and he did everything for his beloved king, but i'd love to read it again.