Aquamarine by Terry Bolryder

Marina, the last unmated sea dragon, is about to make the toughest decision of her entire life. The Mercury dragon, hated prisoner of the earth dragons and the only person willing to help her when she needed it most, has been captured. Taken away by compatriots he never knew existed, possibly to face execution. Her only choice? A one way trip to the distant planet of Drakkaris, to risk everything in the hopes of saving the one person everyone else says is irredeemable. But deep in her heart, she knows there’s hope. If only she’s not too late…

Mercury knew his past would catch up to him. He just didn’t expect alien dragons from another planet to be the ones to take him away, ready to serve him his just desserts. But everything is turned on its head when Marina, the only ray of light in the darkness that is his existence, mysteriously shows up at the last second, offering herself in exchange for his life. But Mercury can’t to let the only person that matters to him now give herself up. So he joins a proposed challenge, where six sexy dragons will be competing for the chance at being Marina’s mate.

Mercury may claim that he’s only competing to offer Marina protection, but even he can’t deny the sizzling chemistry that quickly boils over between them. For the first time in his life, Mercury is wanting more, and regretting the person he has become. But it may be too late, because Mercury is about to find out that the past always catches up, sometimes with lethal consequences.