My fave is definately the super hot Sinful Secrets!!! The title says it all
That book goes everywhere I go ! Of course the spice
is mind blowing
, but it is the characters that are really gripping, as well as the love born between them in the face of pure evil.
First read was Southern Seduction way back in my teens , so that one will always be a fave too 
Sensations and Forever Kiss was not that great and I hope her 2007 novel is better fare than His Black Book. The only good thing about it was the burgeoning romance between teh detective and one of the girls. That was nicely written.
But all in all TD still remains the Queen of erotic romantic romance!