Dragon`s Legacy, Legacy of the Dragon, Ryu no Yuigon
Ryuu no Yuigon
Kitasato, Senju (Story & Art)
Right(→) to Left(←)
Manga Description

Half-dragon, half-human Asagi is sworn to protect the demon-lord Tenran-sama ever since birth. What makes things difficult is that said Tenran-sama turns out to be a boyish-looking blonde who exercises a great deal of time and effort in getting Asagi to sleep with him. Not to mention the number of rivals who are looking to steal Tenran\'s immense powers. (Source: Yaoi Manga Recs)