Dragon Destiny - Dragshi Chronicles, #1

The awakening of his dragon soul twin brought Dragshi Lord Branin the freedom of flight and near-eternal life, but not happiness. For eons, he feared he would never find a woman with her own dragon soul partner-until one day another's mind touched his. Branin is the last dragon shifter born in over three hundred years. As a dragshi, he can take the form of his dragon soul twin, Llewlyn and knows the freedom of flight, but not happiness.
Both are the last of their kind and have waited millennia for their mates. When a faint thought impinged on Branin's mind, hope for an ending to eons of loneliness soared. Plagued by doubts because no signs of a dragon shifter's birth have been seen, he searches the world for the mysterious girl he only knows by the name, Anastasia. However, the firebrand raider, Lady Broch of Ky'port has her own plan--to wed the dragon lord -- with or without his willing cooperation.
And she will not tolerate anyone from standing in her way.