Loving the Enemy by Clare Connelly

One night of passion will bind them for a lifetime…
Their first marriage was a disaster. Cold-hearted billionaire Massimo Montebello needed Alessia as his bride to complete a valuable merger, but that was never enough for love-struck Alessia. She had no choice but to leave him. Five years later, an unexpected turn of events sees her propositioning the man she’d sworn she’d always hate: one night together – no strings and definitely no promises.
But even the best-laid plans can go awry and six weeks later Alessia discovers there’s a life-long consequence to their one night of uninhibited passion! Massimo’s new ultimatum is impossible to escape from: marry him for the sake of their baby. But what about Alessia’s heart?