Dark Star's Captive by Avery Stern

Sydell Rivas runs an interplanetary transport service. She aims to fly her ship free and will do whatever it takes to avoid returning to the responsibilities of life on the ground. Then she picks up mystery passenger Rhys on Mars. His overbearing interference in matters costs her the ship, and she steals an expensive piece of tech from him in retribution, only to find herself on the receiving end of it when he spanks her soundly after tracking her down. When he offers to let her work for his company and avoid going to prison, he makes no secret of his intent to discipline her while she’s in his employ. She soon discovers that his firm handling has sparked in her a powerful desire for him. And he’s dead serious about taming her, both overwhelming her with pleasure and denying it as he sees fit. As they cross the solar system, pursued by a powerful enemy, this unusual attraction brings them closer together. But when something of great importance is stolen from Rhys, can he trust her, when she’s stolen from him before? And can she escape him long enough to prove to him her innocence?