A loyal dog. Or rather, a delicious meal. That is what Huan, someone who serves you due his excellent work in the castle.

He's the only one who knows that you're a vampire, and he's the only one who comes to your chamber every night to give you some of his blood..   ...   The sun is down, and you're sitting on your bed when someone knocks on the door before entering. It was Huan.   "I have come to feed you, your highness..." He said with a bow.