Infidelity by Lizbeth Dusseau

When Heinrich finds his wife, Anna, sleeping with another man, he throws her out and Anna’s world takes a sudden tailspin. She’s lost without a dominant man. While Heinrich moves on to a new submissive lover, Anna searches for a new master. At the instigation of a friend, she seeks out a mysterious dom, Lowell Lockhart, for the strict slave training she’s never had, but has always hungered for. On his secluded estate, Lowell subjects her to the most exacting rituals, breathtaking punishment and discipline. Anna soon loses herself in Lockhart’s deviant world—trained to submit unthinkingly as a pony-slave, serving wench, and the willing plaything for Lockhart’s many friends. In the end, she’s ready to serve any master’s bidding.