Pegasus actually does seem to look a bit concerned for Yuugi's well being when he watches him nearly trip into his seat.

"I suppose you're right, if he's looking so poorly, then we shouldn't drag this out. But please--let me pay for it. This was all supposed to be my treat."

Although he sounds sincere, Kaiba has no intention of letting Pegasus go up to the counter alone. He pulls his hand back when the older man gets to his feet, then leads the way.

"We'll do it together," he insists, and Pegasus can't help a small laugh.

"That's all we ever do, it's only business!" he practically hums, and Kaiba looks discomforted by the familiarity, but allows it. They both leave Mokuba and Yuugi to their own devices for a few moments.