Lex hadn't forbidden Lionel to attend, to the best of his knowledge, but Aimery hadn't really expected him to show up either. So it was a bit of a shock for him to glance away from the small group he was chatting with and spot Lionel's unmistakable mane. He was content to keep his distance and one eye on him, knowing Lionel's son preferred it that way... but then he glanced again and recognized his costume.

He just had to at least confirm his suspicions and say hello. Sure, he considered himself off duty and had had a drink or two, but it was Aimery's job to greet the guests and make sure they were enjoying the party, wasn't it? Surely Lex couldn't get mad at him for simply doing what was asked of him as long as he made that his focus. After excusing himself from the conversation, Aimery retrieved a fresh glass of wine from the caterers, had a good, discreet look around to make sure his bosses weren't going to see, then made a beeline for Lionel, approaching from behind.

"Your wine, sir," he announced as he rounded him, holding out the glass as if he meant to deliver it, then put on a suitably surprised face when he 'saw who it was'. "Oh, Mr. Luthor! Apologies, I thought you were someone else. It's so good of you to come."

Aimery had no illusions that Lionel would be fooled, but he at least had plausible deniability.