Fujiwara Kaoru: Vampire Girl is really good. She has also written a bunch of short story collections which aren't quite as good, but can be interesting: Fetish, Paradise, A Story of Long Ago, and Withdrawal Love
She is my favorite josei mangaka and her art is just beautiful! I loved all her stories even the oneshots were great. i wonder why did she stopped releasing .
And pretty much all non-shounen-ai titles from YUMEKA Sumomo. I know most of them are marked as shoujo, but they are josei in my opinion.
JOIN EVIL FLOWERS!!!~ ♥