Don't cry don't cry don't cry don't you dare cry. Why the hell is he about to cry anyway? This almost certainly isn't even his specific Papyrus.

...he's about to cry because it's been actual years>o? since he's seen his brother when he was this tall and this old and this loud and enthusiastic and alive and and...

Sans hiccups pathetically and then covers his mouth with his hand, looking away for a minute. When he looks back, he's managed to muster up an approximation of his usual smile.

"well, i'd like to. but tibia honest, it's been a pretty long morning. i'm already kinda beat. maybe if you can carry me the rest of the way outside, i might be able to muster up the energy to tell ya what's going on."

Or at least a carefully edited version of it.