**Moonlit Secrets**

The stranger's words hung in the air like a challenge, and Katsuki's instincts screamed at him to be cautious. He took a step back, his eyes locked on the stranger, as if sizing him up. Izuku, sensing Katsuki's tension, moved forward, his eyes flashing with a fierce determination. "I'm not interested in games," Katsuki said, his voice low and even. "What do you want?" The stranger smiled, his eyes glinting with amusement. "Oh, I think you are, Katsuki. You see, I know all about your little secret. The one you've kept hidden for so long." He paused, his gaze flicking to Izuku. "The one that makes you so... special." Izuku's eyes narrowed, his face set in a determined expression. "What are you talking about?" he demanded. The stranger chuckled, his eyes never leaving Katsuki's face. "I'm talking about your immortal existence, Katsuki. I'm talking about the fact that you're a vampire." Katsuki's heart skipped a beat as he felt a surge of adrenaline course through his veins. How did this stranger know? He had been so careful, so meticulous in covering his tracks. He turned to Izuku, his eyes warning him to stay back, but Izuku just took another step forward. "I don't know what you're talking about," Katsuki said, trying to keep his cool. But the stranger just laughed. "Don't play dumb, Katsuki. I know all about your kind. And I have to say, I'm intrigued. You see, I've been searching for someone like you for a very long time." Izuku's eyes flashed with anger. "What do you want with Katsuki?" he demanded. The stranger's smile grew wider. "Oh, I think we can come to some sort of arrangement. You see, I have something that Katsuki wants. Something that will change everything." Katsuki's eyes narrowed, his mind racing. What could this stranger possibly have that he wanted? And what did he mean by "change everything"? He took a step forward, his eyes locked on the stranger. "I don't think we have anything to discuss," he said, his voice cold. But the stranger just chuckled. "Oh, I think we do, Katsuki. You see, I have information about your past. Information that will blow your world apart." Katsuki's heart skipped a beat as he felt a surge of fear course through his veins. What did this stranger know? And how much was he willing to reveal? Izuku's eyes flashed with determination. "We're not going to let you hurt Katsuki," he said, his fists clenched. The stranger laughed, his eyes glinting with amusement. "Oh, I don't want to hurt Katsuki. At least, not yet. I want to make him an offer. An offer that will change everything." As the stranger's words hung in the air, Katsuki felt a sense of unease wash over him. What was this stranger offering, and what did he want in return? He glanced at Izuku, who was watching him with a concerned expression. "I think we should hear him out," Katsuki said, his voice low. Izuku's eyes flashed with anger, but he nodded. "Fine. But if you're trying to hurt Katsuki, you'll have to go through me first." The stranger smiled, his eyes glinting with amusement. "I wouldn't have it any other way," he said, his voice dripping with sarcasm. As the three of them stood there, the city lights twinkling below them, Katsuki felt a sense of foreboding wash over him. What was this stranger offering, and what would be the cost? Only time would tell.