Not So Accidental Baby Daddy by Shaw Hart

Luca Golding knows what he wants. His head of public affairs, Nora Smith. For three years, he’s waited for her to come to the same conclusion. When he overhears her talking on the phone about quitting, he knows he needs to do something before she can get away.
An argument leads to the hottest sex of his life and then… nothing. She calls in sick, dodges his calls, and just generally avoids him. When the security he has on her informs him of a particular drugstore purchase she just made, he thinks all of his dreams are about to come true.
He should know that nothing about Nora Smith comes that easily.