Annemarie Nikolaus 
The Piratess [EPUB ebook] 

Dragon World: Nanja, the piratess from the Floating Islands, steals a dozen horses from the nearest continent. A nobleman from Dragon Island aims to consolidate his power with the spectacle of the horses competing against the native dragons.
But first a dead calm, then an earthquake and finally an attack by demons threaten to ruin Nanja's business with the nobleman. It seems as if the horses should not reach Dragon Island.
Then Nanja’s client himself becomes her enemy, because he sets his sights on Ron, the one of the seafarers who is able to handle the horses.
And the nobleman is not the only threat to Ron…
Every novel in the series is a stand-alone.