Tempt Me by Tara Wyatt

Violent, ruthless, and obsessed, Killian Byrne is a man who rose from the ashes of chaos to make a new life for himself. One in which he does what’s needed to protect the city he’s come to love, even if that means a life of loneliness. He’s damaged and scarred after years as a mob enforcer. Broken. And that means he’s better off alone.
But then he meets Whitney Vanek, a woman who is sunshine to his storm clouds, light to his darkness. She’s everything he can never have.
Over the years, his obsession with Whitney grows, until finally the temptation to make her his proves too much for Killian, especially knowing that Whitney’s life is in danger and he’s the only man who can keep her safe.
Outspoken, charming, and confident, Whitney Vanek has never met a man immune to her charms—until Killian.
And she tries to convince herself that she doesn’t care that he doesn’t want her. He’s broody, grumpy, and more than ten years older than her.