It takes everything he has not to recoil from that touch. There's too much in it that's reminiscent of that last moment with his father, and all the conflicted feelings that stirs. But he stands his ground; if Snoke taught him anything, it's how to do that.

And when he hears the way Vader speaks those words, something inside of him utterly shatters. It carries all the feeling he's ever wanted, spoken by someone he'd desperately wanted acceptance from. Not for his reputation or his power, but for simply being his grandson.

He doesn't dare try to speak, and he wills away the tears welling in his eyes, bidding them not to fall. But the emotion is plain on his face no matter how he might try to keep it in check.