Pls help me find this bl

I read this bl 2 or 3 years ago and stopped. so im not sure about the details and ive been searching for it again for a week now. its kinda historical but im not sure

the seme is a king who has a girl he loves but is really sick so he tries to find a cure then the uke came i dont remember how they met but uke has scales that can help cure semes lover i dont know what species he is, but after the seme finds out he. so he tricked uke to fall inlove with and get his scale to cure the girl but after being together starts to fall inlove with uke but suddenly there was some drama and thought that uke betrayed him so he locks ukes then he regrets so when he visits uke, uke gives up his life for their baby to survive turns out he was pregnant so uke disappears leaving the baby seme regrets and raises the baby until he died.

I only read it until there cause i got bored at that time but i wanna reread it know im also not sure if i accidentally mixed 2 stories or not because its been 2 or 3 years