He laughs, somewhat disbelieving but mostly fond. There's something sweet about reading to a younger sibling, bittersweet in doing it while they were laying in a hospital bed. Papyrus is far away from kindergarten age, but it still reminds him of the little girl he'd left back home and her instance at hearing fairy tales even when she was too sick to keep her eyes open. It's a very personal thing, that kind of dedication between siblings and it's why he's shaking his head, letting the moment remain private.

"As awesome as I'm sure you're storytelling skills are, I'm going to bail." He steps back, casts on last smile down on Papyrus's sleeping form. "I'll see you when you're both out of here."

With a small salute to Sans, he takes another step back and disappears.