Lassoed (Heart of the West #3)
Ann Jacobs

Diana McTavish has long held his heart and soul. Now that her abusive ex-Master is history, Matt's back in her life — permanently — however she needs him. But submissive Diana's had enough of being bruised and battered. She's taking control. And if that means Matt suppressing his own needs and submitting to her domination — hell, he can do it.
As the sexual heat between them flares hot enough to burn, Diana relearns the most important lesson of Dominance and submission — trust. And this time, the switch is up to her.