Yes, it's Kaori Yuki who is the artist. She's soo good, ne? Her artwork is very artistic and beautiful. Have you read Angel Sanctuary, I haven't, but it's good?
The artwork is great, don't you think? And yes... it IS a bit on the kinky side, the series is actually quite kinky... it's really good!
It's about this school teacher named Adrian who is also (on his free time) a murderer...

He gets in touch (!) with a young boy prostitute who he falls in love with and becomes obsessed with. Their story is a tragic and interesting one... *romantic shonen ai fangirl sigh*
I can recommend it!