Make Me, Sir (Masters of the Shadowlands 5). Masters of the Shadowlands, #5

[Reprint] Her job is to make his life miserable. His job is to make her submit. Whose heart will surrender first?Across the country, rebellious BDSM submissives are being systematically kidnapped, one from each club. When her friend falls prey to the slavers, FBI victim specialist Gabrielle volunteers to be bait in a club not yet hit: the Shadowlands. She finds that being a bratty sub comes naturally, especially when she gets to twit the appallingly conservative Master of the trainees.
But she soon discovers he's not as stuffy as she'd thought. Or as mean. She'd expected punishment, even humiliation, but she sure never expected to fall in love with a damned lawyer. Courtesy of a prima donna ex-wife, Marcus loathes disobedient submissives. When the club owner insists he admit an incredibly bratty trainee, he's furious. But as he comes to know Gabrielle and sees the alluring sweetness beneath the sass, he starts to fall for her.
Unfortunately, Marcus isn't the only one who believes the feisty redhead is a prize worth capturing. And in the world of the slaver, such treasure is worth a hefty fee.