What is this manga?

I was 読書 it awhile back but there were no もっと見る chapters so i left it for a while but now i dont remember the name.
it was about a dragon king in the form of a 16 年 old boy that fell in 愛 with this man with long white hair(yes,there is a little yaoi).they had their battles and the dragon king knew he was to die soon,because he was going to loose his human feelings and go all dragon once he ran out of dragon food.he knew hewould kill his love(long hair dude) if that happened so he made his friend promise to kill him when he went ut of control.

pleeeeease help me!!