The dangerous scent was definitely getting closer, making Itori tense as she thought of how to react. She shouldn't be the first to go on the offensive, but she should be ready to defend in case a dangerous entity had managed to make its way into the guild without anything restricting its actions. Of course an intelligent entity would try to limit the damage it did anyway because even a powerful entity still would have to tread lightly in one of the biggest guilds in Fiore, but that didn't mean that one couldn't try to kill a single target, especially since those who preyed on souls had a tendency to be aggressive towards those with spiritual presence and power. And if the dangerous entity was clever but also stupid it could have made its way into the guild without being aware that if it was too reckless it would get hunted down, in which case it could do a lot of damage before the guild as a whole managed to take care of it.
She could also hear voices now though... two, one of which sounded human and the other was definitely the dangerous entity. She wasn't sure what exactly it was, but her ears could hear some very strange things and pick up on things that other ears couldn't, and it was clear that this voice didn't belong to a human, dead or alive. It was the voice of something completely different, and it put Itori on edge even as she kept working on her cooking as if nothing was wrong while she waited for the potential trouble to actually arrive at the kitchen. It was clear now that it was heading for the kitchen... she could hear it.
When the man entered Itori at first acted like nothing was wrong, checking on one of her dishes before turning around to stare at the newcomer. On the physical level he just looked like a normal human boy, either in the last stages of maturing or just having finished maturing. He also was quite attractive in a boyish manner, although it had been ages since Itori had last really paid close attention to that kind of thing beyond just cursory observation. She could hear his stomach rumbling as it desired nourishment, which was why he had come here. However on the spiritual level... It was bad news indeed. It wasn't the first time that Itori had encountered possession, although this time it seemed the possession wasn't entirely successful as the human soul residing inside the boy was a lot stronger than it would have been if the demon was in complete control. But that didn't mean that there wasn't a demon, and that that demon wasn't at least partially in control of the boy. Itori didn't have her sword at hand, but she could summon it if necessary and as a Kitsune she wasn't entirely reliant on a weapon.
For now, however, she gave the appearance of her usual friendly and polite self, giving Taehyung a curious glance as if surprised by his sudden arrival before fully turning towards him and giving him a polite and friendly smile, her ears twitching when he called out her species out loud after the demon growled it first. It seemed this demon knew of her kind, which meant he definitely wasn't going to be happy with her. Not all Kitsune took a deep interest in the spiritual world, but they all had at least some spiritual power and those who focused on it were often very difficult for demons to deal with, as Kitsune were good at deceiving and trickery to outfox the powerful demons to either get rid of them or steal their souls (not all Kitsune were good, after all, and while they generally wouldn't condone abusing souls they could still mess with demons for less than entirely altruistic and virtuous purposes).
When the human bowed she bowed back, ignoring the screaming from the demon as it seemed like for now at least the human was in control. As she began to speak her voice danced through the air, lyrical and beautiful to the point of being almost enchanting. Itori was suppressing her siren's voice so she wouldn't actually enthrall Taehyung, but even suppressed her gentle and polite voice still was something people had a hard time forgetting. "Greetings Taehyung. There is no need to apologize. I'm aware that I am a rare sight, so I take no offence at your curiosity. I am Shirokawa Itori, and it's likewise a pleasure to meet you. I hope you will find Sabertooth a good home, and if there are any problems don't hesitate to ask me for advice or assistance. I am not anyone of any real importance but I shall do what I can to provide aid when needed." Her bow was just as deep as Taehyung's, once she straightened up Itori tilting her head slightly to one side. "Please forgive my rudeness for asking so bluntly, but can I safely assume that you are aware that there is a demon possessing you, and that you are capable of hearing what it says?"