Bill Kaulitz vampire

The reinforced concrete whisper of Bunker 0-9 became their shared torture chamber. Outside, the world had turned into a gray jelly of ashes and the howls of the Hollows—those who had once been proud sons of the night or masters of the forests, now reduced to nothing but hungry shells.
Erica pressed her palm to her side. The wound from the Hollow's claws oozed dark, thick blood. As the last purebred vampire of her kind, she felt the history of centuries drain away with every drop. And next to her, breathing heavily, sat the one she should have killed a century ago.
Bill Kaulitz looked like a ghost of his faction's former glory - a leather jacket caked in dried blood, lined eyes with a mocking expression, and a silver knife that he lazily tossed in his hand.

"You know, Erica," Bill broke the silence, his voice vibrating with poorly concealed venom. "Your blood smells... of disappointment. Before, you 'purebloods' reeked of ambition and expensive wine. And now? It's just rotten meat. Almost like those creatures behind that door."
Erica bared her fangs.
— Shut up, Kaulitz. If it weren't for this virus, I would have ripped out your tongue and fed it to your pack. Oh, wait... your pack is now scratching at the steel doors, trying to lick the glue off the hinges.
Bill froze. For a moment, anger flashed in his eyes, but he suppressed it with a short, barking laugh.

— Fair enough. But for now, I'm the only one who can inject you with a regenerator and keep you from turning into a Hollow. So show a little respect to the "lower faction."

Suddenly the door shook. The impact was so strong that concrete chips rained down from the ceiling. The motion sensors went crazy: "Empty. Multiple contacts."

"It's your time to shine, Your Highness," Bill stood up abruptly, his movements jerky and predatory. He extended his hand to her, but immediately pulled it back as if he'd been burned. "Remember how your clan burned down our orphanage in the '90s? Consider this my bill today."

“If we survive, I’ll let you expose him to my father personally in hell,” Erica hissed, transforming.

her body was breaking, her bones were lengthening