Hope Someone Can help me Find this Book

I believe it is 2nd in a series - or at least early in the series.

Romance novel/ paranormal
heroine is 20's and has white hair
Her parents are deceased - she believed her brother was but he turned up and is something medical.
it turns out the brother and her have some special skills
the brother is in very little of the book - he asks his friend to watch over her
of course - both the friend and the sister don't like each other
the heroine was adopted I believe and her father is very strong warlock/wizard or something
the friend/hero and his kind are very strong - not human but they can be enslaved by these wizards
the friend/hero had been enslaved prior to this book at some point in the past
the heroine had been on a trip to maybe Nepal or some such and was given this pendant/talisman something like that

it turns out that the hero's kind can have their essence put in these type of talisman/ pendants and that her talisman/ pendant is a formerly living person who had his essence turned into the talisman/ pendant

She is basically addicted to the feeling of the talisman/ pendant
She and he smoke this type of substance to help her withdraws
They fall in love as they have to rescue each other
He takes her to his house after they are attacked at her apartment
her father is trying to get her
they mentally tie themselves together
he turns into something when they have sex - but it's still human-ish// he has wings
to save her - he allows himself to be taken by the warlock
he is on the surgical table to be cut open and made into the talisman/ pendant - but she comes in and helps save him

she is able to click his people out of the spell that enslaves them.....

any ideas???