In Sin with the Wolf by Ana Calin

Melanthe:
Achilles Wolf is bad news. He’s the youngest of the Wolf brothers, and cocky as f*ck. And who can blame him? He’s a mean ass shifter bursting with testosterone, used to the favors of older rich ladies and young floozies alike. I’d never give such a man satisfaction. But as my destiny will have it, I need him.
With my ex husband dead, I want to take over his seat in the Council and find out who had him murdered. I need Achilles’ protection, and for that he and I must be joined at the hip. But with him as my bodyguard 24/7, resisting him gets harder. The proximity of such a man threatens to become addictive. But I’ll die at the hands of my enemies before I let this wolf become my Achilles’ heel.

Achilles:
Protecting the rich widow Melanthe Skye is nothing but a job to me. Or is it?
Ever since she’s been placed under my protection I couldn’t take my eyes off of her. Something deep and dark binds me to her. Melanthe is a cold beauty with enough strength of character to crush a king, and yet there’s something deliciously vulnerable about her.
F*ck, I want to possess that beauty. I want to see this woman kneel in front of me, submit to me. The Ice Queen, giving in to her knight.
I promise that I’ll submit her to my lust if it’s the last thing I do. And when I’m done, and her enemies are dead, I’ll claim the ultimate prize. I’ll have her do the one thing she swore she’d never do. But when I discover a deadly secret, I realize she needs me more than she lets on…