Merciless Series by Trista Jaszczak, the Graphics Shed

Mercy Knight knows that she can count on men for three things in life. Headaches, heartache, and sex. When she finds herself doing the unthinkable with a no strings attached booty call, she finds herself with another headache and heartache. She vows again that she doesn’t need a man and turns the page to a new chapter in her life. But Ryder Preston has other plans for her, even if she does resist every step of the way.