Thanks to beta checker Latent Kindly, he's happy to help and looking for work.

'Italics' = thoughts/flashbacks

"Italics 'Italics' Italics"= thought within flashback

"Text" = Normal talking

The entire Underground woke up that day feeling like they should thank Sans for something. But only three people actually knew what to thank him for; and one of them was not in the mood to do so. As for Sans himself. He woke up in his bed…

'I WOKE UP IN MY BED! I DID IT!' Sans nearly screamed aloud in happiness and triumph. Instead he settled for a quiet, "heh. get dunked on." He sat there, grinning, not fake grinning; but actually grinning with happiness, it was the first time in years! He held onto this happiness before his grin fell a little as he checked the time. Something was wrong. 'where's papyrus? it's nearly eight o'clock! paps never sleeps in past six thirty, i need to check on him!'

Sans walked down stairs quickly but carefully.

"hey, hey paps? you, uh, you home bro?" He called out on his way down.

On the lounge downstairs was Papyrus, skull in hands.

"paps? you okay bro? you awake?"

"I am fine brother... I simply need a moment."

"you sure bro? you don't seem like yourself today. you need a break or something?"

"I am fine. You go ahead. I shall tend to my puzzles in a minute."

"uhh, sure thing paps. you need me to do anything for you? get you something?"

"Simply doing your job today would be enough for me."

"no promises, 'cause as you know," Sans said, as he walked out the door. "i'm a lazy bones."

Papyrus raised his head as Sans left. 'Was it all just a dream? A nightmare? My Sans was right there; just in front of me, or was it a facade? A trick? A lie?' He released an exasperated sigh. He would attempt to get Sans — the real Sans — to open up at dinner. None of that faux demeanor, folly or attempting to change the subject. Satisfied, he got up, grabbed his keys, and raced off to tend to his puzzles in attempt to take his mind off of this 'nightmare' business. At least until dinner.

As soon as she got up, Undyne was raging. 'Sure, he saved us all, but he could have done it sooner! I'm going to make him fight me; I don't care If he wants to or not!'

Sans sat down at his sentry station and checked his stats. '10 HP? heh, i'm finally getting my hope back, after all this time. i've finally done it, i've beaten them. i never could before. not that i never tried. but. something seems off. paps not waking me up in itself was weird. paps using an inside voice? something was definitely wrong'. He laid his head on his arms. 'what had happened? why was it different this time? was it because i won? maybe. i need to think on this.' He checked his watch. 'i've still got two or three hours till the 'kid' comes through. maybe a nap would help... yeah, i have some time to nap.' He closed his eye sockets and started to drift off to sleep.

Undyne was wearing her usual attire; tank top, jeans, and a waterproof parka she had gotten from Papyrus. She recalled what he said when he gave it to her…"'IT WAS A "WELCOME NEIGHBOUR" GIFT FOR ME AND SANS. AS I HAVE NO SKIN, I HAVE NO NEED FOR THIS; SO I THOUGHT, 'UNDYNE MIGHT NEED THIS MORE THAN I DO,' ESPECIALLY WHEN YOU COME TO VISIT!"

'I'm going to get to the bottom of this the fastest way I know how... Beating the crap outta Sans until he tells me what I want to know!' Her eye glinted dangerously as her spear shone into existence in her hand as she stomped towards Sans' station. 'I need to relieve some stress anyway.'

Sans' nap was disrupted when he heard something odd.

"NGHAAAA!" Falling off of his chair, onto the snow, just in time to save himself. He looked up to see his sentry station demolished, nothing more than bits of wood.

"uhhh, heya undyne." Something is most definitely wrong if Undyne is attacking him.

"you need somethin'?" Sans said, an effort to keep up his indifferent, lazy act.
"FIGHT ME!"

"what?"

"YOU HEARD ME! FIGHT ME!"

"you, uhh, you feeling okay undyne?"

"FIGHT ME OR I WILL MAKE YOU!"

"what!? why!?"

"JUST DO IT!"

"i think you need to see a doctor!"

"NGAAAAHHHH! THAT'S IT!" Undyne yelled, swinging her spear.

"wait hold on now! don't be hasty!" Sans tried to interrupt.

*click click beep!*

"...crap."