Always and Forever by Beverly Jenkins

A desperate need

Sassy Grace Atwood never expected to find her proper self accidentally tumbling into a stranger's bed. If she weren't desperate for a man to lead a wagon train of brides to a woman-starved town out West, she never would have gone near Jackson Blake-former lawman or not. She should send the ruggedly charming Texan packing...only he's perfect for the job. Now if her mind would just stop going blank every time she looked at him, they might get this train to Kansas yet.

A comsuming passion

What's a man to do when a beautiful woman leans over his bed in the middle of the night? Come to think of it, that was the only time Blake's ever seen the straitlaced Miss Atwood the least bit ruffled. He's certain that beneath her buttoned-up appearance lies a passionate woman aching to break free. But though Blake longs to take her in his arms, all he can offer Grace is a life on the run. And when the demons from his past catch up with them, Blake is couaght between the ties that bind and a love that could last...always and forever.