Staying up all night had, unsurprisingly, shattered Sans's previously intact body clock.
Sans drowsily changed into another jacket and made his way to the living room in a haze.
Although he was very... sleepy, he needed to make sure the human didn't do anything out of line.
In the living room, Papyrus was serving the human the spaghetti he had prepared. The human seemed to love it; after only a few bites, it slipped out of their mouth because it tasted so good.
It must have been too delicious to handle. Surely they wanted to finish it in several sittings.
"To be honest... Sans, the human just told me... they're leaving after breakfast. It seems they're very determined to get home...
Right now, I'm feeling more conflicted than ever before. If you leave, I'm definitely going to miss you."
Whether deliberately or by chance, Papyrus noticed the spaghetti the human had spat onto the floor.
It actually spelled out "I'll visit"!
"WOW!! Human, you spat out my spaghetti just to tell me this!!"
Papyrus hugged the human tightly, a smile brighter than ever spreading across his face.
"I knew you'd do that!!!"
Beside them, Sans was on the verge of falling asleep on the floor after barely sleeping the previous night.
I'm so sleeeepy.
At the border between Snowdin and Waterfall, Papyrus was saying his final goodbyes to the human.
"The temperature in Waterfall is much more normal than in the snowy region. That outfit should be just right! Remember to visit me often. A friend like you is hard to come by!!"
The two said their final goodbyes, but just as the human was about to leave, Sans stopped them.
"Hey... kid? I'll come find you during my lunch break in a bit. How about we grab something