He hated this. He hated when there was so many unknown people in the castle. He hated that there were so many unknown variables to this type of situation. He hated that Tomoyo didn't need a reason to throw a party and he was always, always dragged into guard duty. What he hated the most was the reason for this party.
Kurogane was standing in a dark corner of the room, sharp eyes taking in the people, looking past the bright colors of the various outfits, avoiding the ones that hurt his eyes, and senses on alert for any ill intentions. Everything seemed to be going smoothly so far, which was good because he found his attention drifting more often then not.
Fai was on the far side of the room, dressed in a kimono of blues and golds, easily spotted in the crowd with his bright hair and pale skin, surrounded by a group of curious people, allies and friends of the princess, all looking in awe as he talked and laughed, waving a hand around with a smile on his face.
The blonde man was the reason for the party in the first place, even though Tomoyo would deny it. She never really needed a reason to throw a party, but Amaterasu was in charge of this one and who was invited. She was showing off the newest addition to the castle. There were several magic users, or ones who were sensitive to magic, who would be able to sense just how strong the mage was and they would know that he was here, loyal to the princess and they shouldn't mess with him.
He didn't like the thought of Fai being used like this, for some agenda, but Fai seemed to be enjoying himself, so he couldn't really complain... at least not a lot. He had made his displeasure of the situation known well before the guests started showing up.
A familiar laugh filled the air and Kurogane found his attention drawn to Fai yet again. He looked so happy, content with what was happening, Red eyes flicked to the man standing next to him, hand on a slim shoulder and leaning in close, saying something that an embarrassed flush cross that pale face that was clear to see across the room.
An uncomfortable, unfamiliar feeling twisted strongly in Kurogane's chest and he was taking two steps towards the two before he realized what he was doing. He clenched a fist, forcing himself back. He had to stay out of the way, and forcing this guy to stop touching Fai wasn't an excuse to break the rules. He didn't like feeling like this.
"Would you just relax already?" A soft voice by his elbow nearly made him jump (only nearly. He is a ninja after all. He doesn't jump like that thank you very much). He looked down at Tomoyo, whom he hadn't even noticed made her way over to him. She was looking out into the crowd, eyes on Fai laughing again at another joke someone told him.
"You know I can't let my guard down at these things." he said, crossing his arms and refusing to look at her. He knew if he did she'd be able to see through anything he says.
"I'm not saying drop your guard. I'm saying just relax a little. Fai is having a good time. He's fine. There's no need to get upset that he's getting so much attention."
"... I'm not upset." He doesn't get upset, not about something like this. He just... wanted to go across the room and pin the blond against the wall and let everyone know that he was taken. That would be completely reasonable, wouldn't it? No... There's no way that would go over well for anyone.
Tomoyo just hummed softly, finally turning to him with a knowing smile. "Sure you're not. Just remember that there's only a few hours until the parties over, then you can have all the time in the world to let out your frustration."
An embarrassed flush crossed Kurogane's face and he opened his mouth to protest, but she was already walking away, a soft giggle following her. He snapped his mouth shut, turning his attention once more to Fai, eyes on his smile, already thinking what he was going to do once they were alone.