Dragon’s Blood by Kristen Middleton

Previously titled Blood of Brekkon

To save her sister from a mysterious and deadly skin affliction, Healer Natalya Phron offers herself to a silver Dragon-shifter named Brekkon, whose blood may be their last hope for cure…
Brekkon Liamson always believed that gambling was his only vice, until he meets beautiful, golden-haired Natalya. Caught between old family customs and a burning desire to claim her for himself, the Dragon-shifter knows he’s playing a dangerous game, but is willing to risk everything for his new found treasure. Unfortunately, not all is as it seems, and Brekkon soon learns that Natalya has been playing some serious games of her own…