"Papy!,I'm going to Undyne's lab!She wanted me to try a new invention of hers!" Sans yelled putting on his cyan boots."Alright bro just be back by 5 PM "Papyrus responded."I will!"Exclaimed Sans. "My brother was always a little too overprotective of me but I know it's for my own good" He thought as he walked outside.Blue heard the snow crunching under his feet with evey step as he greeted people whom greeted back.
~Undyne's lab~
"Ok so basically you use this machine over there to go to different universes."Undyne pointed to a large machine and looking like she's holding back excitement."What if something bad happens?"Sans asked worriedly."If you get in a tough situation then just press that button and it'll send you back " Undyne smiled and continued "I really hope it works!" and tossed me a metal square with a big red button on the middle.Sans hopped in the machine with his soul pumping fast.Inside the machine it was like an evaluator with button options: Undertale,Outertale,Underswap,Aftertale,Underfell,and one that just said error.
He presses the Underfell button and bright light appeared blinding him temporary.When Sans opened his eyes he saw Snowdin?But it wasn't it was darker and duller and there was dust on the ground...Blue was terrified at the very least but he still had the courage to keep walking.Suddenly he was grabbed by his blue bandana and he could barely breath."Who are you?You pathetic weakling."A tall skeleton harshly said."I'm Sans please let go of me!"He manged to say from the little oxygen before he fell to the ground."Ow..."Sans wined and getting up."You can't be Sans, idiot!"Papyrus hissed."I've never even seen you around either!"."Maybe he's one of those alternative universe." "Ugh you one of those soft universes?"grumbled in anger."Yeah actally I'm from Underswap!"Sans replied."I always hated those AUs...They're too weak and should DIE" UF Papyrus shouted and preparing a attack."WHOA WHOA WHOA I don't want to fight you!"Sans worriedly said."Whatever I'll spare you just because I'm in a good mood."Papyrus turned around and walked away.Sans sighs as he presses the red button on the square.
Blue appears in Undyne's lab seeing a VERY happy fish."DID IT WORK?DID IT?????"Undyne happily yelled."Yeah it did and it was interesting..."Sans told Undyne about what happened with the Underfell Papyrus."Hmmmm...That's werid I expected them not to know about the other universes.Do you think you can go back there for more research?"Undyne asked curiously looking over at Sans."Umi sure if Papyrus let's me go then yeah!"Sans
Stated thinking if Papyrus would let him go on a possibly dangerous mission,I mean he was almost attacked on his first visit."Well we're done with this today you can go home now!"Undyne said stretching a little.He was brought back to reality and answered "Y-Yeah!" as he walked out the lab and walked back homeAs he was walking home he couldn't help but think about the other Papyrus and somehow made him feel werid not in a bad way but in a good way. He thought "What am I thinking that guy almost attacked me!" and scolded himself for having the slightest feelings for that Papyrus.
After scolding himself he arrived home and announced "I'm home Paps!" taking off his boots and putting them near the door. Papyrus was on the couch smoking a cigarette and watching some Napstabot show."Why did you come late?"Papyrus demanded answer. He looked at the clock it was 5:31PM."Oh um I lost track of the time " Sans responded a bit timidly."I wanted to ask you something can I go back to the Underfell AU because Undy-"Sans was cut off by Papyrus."WHAT?Are you crazy Sans?Underfell is one of the most dangerous AUS "Papyrus responded with anger in his eyes but also caring emotions. Sans HAD to go back he didn't like being a lier or going against his brother but he really wanted to go back. The only way he would be able to go out without Papyrus asking him where he's going was by sneaking out the house.
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Envious~Edgeberry
FanfictionUnderswap Sans gets a chance to go to the Underfell universe and someone gets a little envious.