Do you guys know this Yaoi Manga?

It's about this seme who is a king (I believe), he has an uke who he takes in. They are basically lovers. Anyways, the king always gives sugar cubes to the uke, to which the uke always keeps. Anyways, the king becomes powerful, and he takes in other concubines, and forgets about the uke. The uke is really sad about this, something happens, and in the end, the king realize that the reason he wanted to be powerful in the first place, was for the uke's sake.