UNDERTALE ONE SHOTS!

Acting like them

This is younger you so like a friend ship sorta. You'll be a year older than Frisk and you act like a family towards them.
Oh and it's Halloween!

Sans and Papyrus were just sitting in the couch waiting for Frisk and (Y/N) to take them out for trick or treating.
"Nyehehehehehehe!"
With that a Frisk dressed as Papyrus jumps out "I THE GREAT FRISK WILL OVERCOME ANY CHALLENGE!" Papyrus quickly hugged Frisk and was happy that they dressed up like him.
SPLASH!
Sans was blasted with blue dyed water, he turned around and saw (Y/N) dressed up as him holding a water gun that is like a Gaster blaster. "Heheh! Sup Sans!" (Y/N) giggled as she ran in front of the couch. Papyrus and Sans both smiled as they saw Frisk and (Y/N) dressed up like them

~3 hours later~

Frisk and (Y/N) were way ahead of Sans and Papyrus knocking on doors asking for candy.
"SANS I THE GREAT PAPYRUS LOVE HOW THEY DRESSED UP LIKE US!" Sans nodded in agreement "Yeah Bro I like it to."
Up ahead Sans saw Frisk being bullied and was about to save them but he saw (Y/N) blasting water in the bullies faces but they kept bulling. That's when (Shiz) stuff went down. (Y/N) got furious with the bullies and there Gaster blaster water gun turned into a real Gaster Blaster but tiny version, it scared the bullies away and they dropped there candy so frisk and (Y/N) took it. (Who could've turned it to a real Gaster blaster? Gaster? Sans? Who knows) Sans smiled as he saw (Y/N) hugging Frisk
"Sans, Papyrus sorry but SEE YA!" With that Frisk jumped on the mini Gaster blaster with (Y/N) and they flew off
"HEY GET BACK HERE HUMAN FRIENDS TORIEL PUT US IN CHARGE!!" Papyrus chased them while Sans just chuckled and walked towards the way Papyrus was chasing them.
Later everyone was back at the house and Frisk turned on This is Halloween and they danced with (Y/N) and they just giggled while jumping up and down.

~Ze next Day~

Frisk and (Y/N) were both sleeping on the couch of the skeletons residence after eating to much candy. Papyrus was making some spaghetti and Sans, weeeelllll he was making puns as always. "Sans sssttttoooooopppppp I'm trying to sleeeeppppppppppp eeegghhh" Frisk complained, But with (Y/N), they were asleep and not waking up. Sans kept poking (Y/N) face but nothing was waking them up.
"HEY HUMAN FRIEND (Y/N) WAKE UP I MADE SPAGHETTI!" Papyrus yelled.
Nope. That didn't wake them up either until
CRACK.
(Y/N) was up holding a frying pan smacking Papyrus head (I'm so sorry Paps forgive meeeeeeeeeeeeeee!)
"OWIE WHAT WAS THAT FOR?"
Frisk sighed
"How do I put this in words, (Y/N) isn't a morning person."
(Y/N) then got up and walked to a room.
"Hey kiddo where is (Y/N) going?" Frisk just giggled and responded
"Ya might wanna take cover." Both brothers were confused until they heard (Y/N) a battle cry and running out with a GIANT (WEAPON CHOICE) (comment down what your weapon was! I would love to know!) 
"Oh shit/OH SNICKERDOODLE!"
Both brothers ran and ran being chased by (Y/N) until frisk stopped them.
"Hey (Y/N) why not go to see Undyne with me?" With that (Y/N) Happily agreed and walked out the house with frisk.
"BROTHER THEY SURE ARE A WILD BUNCH OF HUMANS." Sans just panted and wheezed out "yeah...."
AND DONE! HAHAHAHAHAHAHAHAHAH amazing!
Warning it is not actually Halloween I just thought this was a cute idea.