[Sans disappearing away gives Papyrus a moment to gather himself, then gather the dishes to the sink and give them a quick rinse, before grabbing the remains of his juice and following.]

Just remember, this isn't your turn to take a nap. [With a little delay he smiles to soften it, because he can see full well that Sans isn't lounging as much as advertised. A lingering unease, and wanting to make this as short as they can, prompts him to add:] Let me know when you start. And if it's helpful for me to, think about other things.