Sulu admittedly knew nothing of Jack's various moods and habits; at least, he knew nothing useful, given the only prolonged contact he'd had with him was during the time Ianto had been dead. He hoped none of those moods or habits were normal for the other man. So when he noticed some amount of reserve in Jack's mannerisms, he didn't know what to attribute it to - politeness, habit or his mood?

It didn't matter, Sulu decided, doing a good job of not slurping his noodles like an ass. The food was good and Sulu enjoyed the company, so come what may, he was going to enjoy the moment for what it was. Besides, there would be time tomorrow to worry and fret, and probably time tonight. He smiled at Jack, knowing full well that for him, there was no future time. He was worrying and fretting and preparing himself for the worst even as he ate. "Very nice, captain. My compliments to your cooking abilities."