These are all the series I recommend:
Dark Swan - Richelle Mead (4 books, completed)
Night Huntress - Jeaniene Frost (7 books, ongoing)
Fever - Karen Marie Moning (5 books, ongoing)
Dani O'Malley - Karen Marie Moning (1 book, ongoing - a Fever spin-off trilogy)
Mercy Thompson - Patricia Briggs (8 books, ongoing)
Shadow Reader - Sandy Williams (3 books, completed)
Kate Daniels - Ilona Andrews (7 books, ongoing)
Enjoy reading!