THE DRAGON OF HOUSE BLACK

No one would assume that England's best seeker, Draco Malfoy is a dragon thanks to the curse of the Noble House of Black. Ironic, surely that the Malfoy name is known synonymously with Blood purity, only for his own to be "tainted."
When Hermione is tortured right before his eyes, the Dragon of House Black is enacted.
With years of mutual pining, things quickly come to a head when their feelings are finally revealed.
But with a new evil rising, claiming muggles must die or serve.. both sides of the Wizarding community are chomping at the bit to use Draco to turn the tide in their favor.
Whomever can procure Hermione could essentially control the dragon, for there is little a dragon won't do for it's mate.