A Deàl With A Billionaire

Damien Sterling is evil. He is so evil he wants me to pretend to be his fiancee before he can help me find my missing sister. The same woman he claimed to be his first love. 
"Call it what you may. I'll only help you if we work together on something." 
Me? Work together with Damien Sterling?  
"What do we work on?" 
"You mean, what are we working on?" A beat of silence. Then, he spoke. "We are going to get engaged. I mean, you're going to act like we are engaged. For six months." 
"Ha!" I cackled, face blank of expression. Then, a burst of laughter escaped me. While he watched me like I was crazy, I just kept on laughing.  
"Are you crazy? I'll be playing house? With you?" 
"I'm serious." 
While playing house with the billionaire devil, I must let go of my dream to be the top investigative journalist of Westmore Times and avoid falling for my missing sister's first love. 
Will this be possible when we are stuck in the same building, filled with heat and forbidden passion crackling between us?