F*ck nature, I won't
Sirius Orion Black was a disgrace to his family. In the most noble and ancient house of Black, he was the only vampire who refused to hunt humans for their blood. It wasn’t always like that, though. In the first twelve hundred or so years of his life, he had lived just like any other Black. It all went wrong when he started to make human friends. Regulus thought his brother had gone officially insane. Seriously, there was no reality in which humans and vampires could get alone, let alone be friends. It’d be only a matter of time before Sirius came to his senses again and sank his teeth in one of those humans’ neck, and if Sirius didn’t bite James Potter, Regulus would do it for him.
He couldn’t stand the sight of his brother hanging out with that human, laughing, joking, playing sports, partying like he was one of them, while James’ heart beat so loud even Regulus who only watched it from afar could barely resist to drink his blood. He did resist though. Another year, he promised himself. He kept convincing himself his brother was actually a whole lot slyer than what he took him for and maybe just played the long game. Mother frowned upon playing with your food but Sirius had always been that childish. Maybe he was just bored and decided to have some fun with his prey before betraying him. If that was the case, Regulus respected that, but only for another year.
“When are you going to bite him?”, Regulus asked.
“Never”, Sirius replied.
“You don’t have to lie to me. I won’t rat you out to that human.”
“I’m not lying”, Sirius said.
“You are though. There’s no way in hell you won’t end up drinking his blood. It’s in your nature to do so.”
“Fuck nature. I won’t.”
“Then I will”, Regulus promised his brother. “A year from now. That’s how much time I’m giving you to do it yourself.”
Sirius huffed and straightened his back to exploit that tiny bit he was taller to its fullest potential to stare Regulus down with a threatening glow in his eyes. “I won’t let you touch him”, he swore.
“Fine. Keep him for yourself”, Regulus scoffed while turning away, getting some space between their faces again. “But don’t let this drag on for more than another year. End this. Get that human out of the way before you completely lose your mind, or trust me, I will, and it won’t be pretty.”
“Oh, I’m so sorry for making friends!”, Sirius snarled sarcastically.
“Friends?!”, Regulus sneered. “You’re a vampire! We’re the only friends you need: your family! We don’t get friendly with humans. We eat them!”
“Maybe you do, but I’m not some bloodthirsty animal”, Sirius claimed. Regulus saw a new kind of hurt in his eyes he had never seen his brother show before. “Not anymore…”, he continued, calmer. He struggled with his words. “…I don’t want to hurt James.”
Regulus straightened his coat and eyed his brother. What he lacked in physical strength, he made up for in his impeccable presentation and his precision. “If you refuse your identity as a vampire, you also refuse the one as a part of this family”, he said. His voice sounded ice cold. He really didn’t want to be the one to say it, but it was the truth. “You know that”, Regulus continued. “The second mother and father hear about this, you’re out.”
Sirius didn’t seem impressed in the slightest. “Good”, he said before he left, forever. He never returned to the house, and he stayed with that human ‘friend’ even more. Regulus always kept an eye on him from afar, and the two were inseparable. Sirius even appeared to pretend to be a student at his school now and Regulus could not grasp how he didn’t completely lose his mind in those hallways and classrooms. Young people like that tasted the best, were the freshest and smelled the strongest. Even when Regulus just saw the high school from a distance, he couldn’t keep his own fangs in check, but Sirius seemed to manage just fine.
Regulus still was part convinced it could all be part of a greater plan: getting rid of his last name that marked him as a vampire, faking a different identity, gaining the trust of some human families, all so he could get into a human school and massacre it when they’d least expect it. Regulus had to give it to him: that was quite genius.