Want Me, Cowboy by Maisey Yates
"Her rancher boss is looking for the perfect wife... and she wants the job! Poppy Sinclair kept her feelings for Isaiah Grayson secret for a decade. When her infuriatingly gorgeous Stetson-wearing boss enlists her help in finding him a convenient wife, she threatens to quit. Until Isaiah counters with an interesting proposal: Why doesn't she marry him? Can she say yes to sharing his life and his bed, but not his heart?