S-4 doesn't doubt for a second that Sans-Serif is telling the truth. It makes sense that poor Frisk fell asleep before hearing the whole thing, and honestly, that's probably a good thing. It means that S-4 read so well they were able to rest peacefully, despite all the pain they had gone through. S-4 must be getting better at reading, like his brother said.

"I'd like to read it again! And, and it would be great if we had a kite to fly right after the story."

He does notice that with Sans-Serif's guidance, they find the library a lot faster than S-4 usually does alone. That's a little strange, but Sanses in general are unique, and that's why S-4 cares for them so much.

He looks around the room and taps his jaw with a finger before pointing towards a collection of shorter bookshelves.

"Okay! The kite book is over there. Come on!"

He tugs Sans-Serif over, getting down on his knees to peer at the titles of the various colourful books.