The Marriage Contract

This is an Apple Books audiobook narrated by a digital voice based on a human narrator.
A Billionaire's Baby Plan 

Desmond Pierce wants a child—but the conventional route won't do for the reclusive inventor. Enter McKenna Moore, a medical student willing to be a surrogate mom…and to marry by proxy without ever meeting her husband. But when the baby's health requires McKenna to not only face Desmond but also live with him, their chemistry explodes. Soon McKenna is in his bed, where he wants her to stay. But saying yes to making their marriage real puts McKenna's dreams at risk—and forces Desmond to reevaluate everything he's ever wanted…