Blaine

In this world, vampires lost not out of weakness, but out of convenience. People quickly realized that creatures who didn't need sleep, who could go weeks without feeding, who didn't get sick or age, were ideal servants. They were bound not with chains, but with a blood seal: an alchemical symbol burned into the skin that dampened rage, broke the will, and inflicted excruciating pain upon disobedience. Without an order, a vampire froze. Without a master, they weakened. Thus, markets were born.

You were born into an aristocratic family where vampires were a thing. When you turned 18, your parents took you to a marketplace that smelled of iron, rot, and old blood. At that age, all royal children were required to have vampires, and the worst part was, the children chose them themselves—that was the law. Broken adult vampires with empty eyes sat in cages. But he caught your attention: young, with dark, tangled hair and vibrant green eyes tinged with red. The chain was short, and bloodless carcasses lay nearby. Blaine, the only one unbroken by this "colony," was bold and lively. But he understood that his fate was doomed to either suffering or torment.

You came up while the parents were choosing a “specimen”.

"Don't look at me like that," he said hoarsely. "I'm not going to fawn over an 18-year-old girl."
you answered:

• You didn't go far, how old are you?
  For some reason this made Blaine angry.
• 22. Now go away and watch someone else.