"Oh." Sulu didn't mean to say anything at that, but the noise came out anyway. He had figured Lisa was a past girlfriend, and someone significant, so the idea that Ianto was going to marry this woman didn't even phase him, but the fact was that he knew how this story ended. At least, he knew how it ended for Torchwood One, and he remembered Ianto, as a teen, telling him that there weren't more than 30 survivors, and what were the chances that it was Ianto and Lisa, making it out of there?

He knew it was futile and beyond useless by now to say it, but he said it anyway. "I'm sorry."