The CEO's mystery heir

Rose is the sweet and kind-hearted secretary to the cold, calculative and unbelievably hot CEO, Alec. She finds herself naked, covered with only his shirt, lying in his bed after a drunken night at a corporate party.
She is enraged and blames him for taking advantage of her but Alec swears up and down that they hadn’t spent the night together. He doesn’t tell her the full story, to protect her from further embarrassment. She relents and ends up believing him. So, she was dumbfounded when she found out a couple weeks later that she is pregnant!
Alec is surprised but equally happy when he finds out that Rose is pregnant with his child, the heir to the Xander Business Empire. The only issue? Rose believes that since they had never shared a bed, her ex-boyfriend must be the father instead. Her ex, the CEO of a failing rival company, shows up in hopes of ensnaring Rose back to him.
How will the over-protective and over-possessive Alec react to some other man rubbing his hands all over the secret to-be mother of his child? Will he be able to tell his secret to Rose and still have a relationship left to enjoy?