Ianto kissed him, cradling Jack's face in his hands to catch the tears. He knew how Jack felt--because he'd felt the same way, watching Jack's struggle every day. He wished that they could stay together, but he knew, deep down, that Jack would have to go back and try to save the world, or the few people left in it, sooner or later.
But not right now. Right now, Ianto wanted to do whatever he could to give Jack comfort, and rest.
"I'm here, Jack," he murmured, though he didn't know where to begin to explain that, or if he even should. "I'm right here."