N. S. Kane 
The Hell Courtesan [EPUB ebook] 

In ancient Japan a courtesan, Jigoku, is the crown jewel of the pleasure house she is bound to, but unlike most she does not hate her job. In fact, she enjoys lavish attention and flattery. But when a humble monk is caught at the doorway, Jigoku finds her darkest secret exposed. Will Ikkyu be able to save this lost soul before the Oni King comes to claim his prize? This sexy and dynamic graphic novel is the work of both N.S Kane and Chris Pitcairn.