MultiAsh
Ooh, I really like where this is going. :0 A dragon kidnapping a princess for his master, and the dragon can transform into a human, so no one would suspect a thing. It's beautiful! I love it. Perhaps his master and the princess met at some sort of ball, and maybe she even met the dragon there, too, while he was in his human form, acting as an escort for his master.
Oohh this is getting so exciting and intense and we haven't even started! x3 But yes, I love all your ideas.