Koisome Ryuu no Amegoromo

"From today you are mine. Serve me well."
Harunada, the son of a Ryujin (Dragon god), in order to appease his father's sadness by the loss of a human wife, visits the brothel Kasumirou, whose workers specialize in taking human shape, to hire a prostitute just like his mother.
Harunada was even disgusted by "love", however, on their way home he meets a human, Chika, injured in the forest. For some reason, he can't ignore the presence of that human, who hated Ayakashi after being separated of a loved one, so he makes him his servant.