There are many layers of meaning there, in that small expression of gratitude, and Daneel thinks he understands -- or at least, he hopes he does.

"Thank you," he repeats, threading their fingers together. He's thankful for many things: the experience, the trust, Ned's confession of love -- he wants very much to be able to say the same, to return it, but he's not sure it's accurate. He can't say it if it isn't true, not if he might harm Ned by being wrong, and affection is a far easier thing to claim than anything as profound as love. Is there even a difference? To him, it doesn't seem like there should be, but... someone human might feel differently. That's the problem.

So he tucks himself against Ned, warm and solid, and he hopes that's enough.