The Fake Fiancée Proposition by Vivian Wood

Meet real estate CEO River, the most anti-marriage son of the Billion Dollar Bennett clan. And Pearl, the gorgeous diner waitress that he happens to have a thing for. Pearl is next in line to inherit a huge property… and the crushing debts tied to it. River wants to get close to Pearl’s heart before proposing that he should take her would-be-tax burden off her hands.
When Pearl confesses that all she wants from life is to have a baby, River has a foolish idea. He offers to knock her up in exchange for Pearl pretending to be his new fiancée. Insane? Sure. But it just so happens that he desperately wants to sleep with her.
Pearl is so baby-crazy that she’s willing to do almost anything to be pregnant. Even if it means deceiving everyone they love. They seal their pact with the steamiest, panty-melting, bang-on-the-kitchen-table kind of sex.
River feels he has a surefire scheme. Everything will be fine as long as Pearl never finds out that River targeted her from the get go. Oh, and one more thing… neither of them can fall in love.