One Last Night by Melanie Milburne

When Maya met Giorgio Sabbatini, he married the penniless waif and stray despite her inferior breeding. So her decision to divorce him now is made with a heavy heart. Giorgio belongs to a notorious blue-blooded family, and their duty to maintain its lineage is unquestioning. Unable to give him the heir he craves, Maya knows she has to walk away.
But the ink on their divorce papers isn't given the chance to dry; after one last reckless night of passion, there's a very shocking announcement....