"Sans, Papyrus, wanna see a magic trick?", frisk asked as she walked down the stairs and into the living room.
"I WOULD BE MOST DELIGHTED HUMAN!", exclaimed Papyrus as he exited the kitchen. He was holding 3 plates of spaghetti. He had incredible balance, probably because of Undyne's training.
"that'd be great kid.", called sans from the couch.
Papyrus flopped down next to his brother and handed him a plate of spaghetti. Frisk stood in front of them, a wide grin on their normally stoic face.
"I gotta warn you though. This magic trick's real special. It might knock the socks of your feet."
"NYEHEHEH! THE GREAT PAPYRUS IS NOW EXCITED!"
Sans raised his eye ridge and leaned back, still holding his plate of spaghetti.
"Alright kid, let it rip!"
Frisk closed her eyes and opened them, a blue glow surrounding her left eye. She raised her hand and pulled it back. Sans' socks and slippers flew off his feet.
Sans couldn't rip his gaze off his floating socks. Surprise was evident on his face.
Meanwhile, Papyrus' jaw dropped. Literally. Along with his plate of spaghetti. What a mess.
A minute of shocked silence passed and frisk raised their arms and did the jazz hands. "…tadah…"
The socks wiggled along with their fingers.
Sans was experiencing a lot of things right now. He didn't know if he should laugh at the pun that frisk just pulled (Knock your socks off! Hilarious!), or be so proud. He decided to do both.
He fell to the floor and turned into a giggling mess. Frisk laughed too at the sight. Papyrus picked up his jaw and popped it back into place. "WAIT A MINUTE… HUMAN, WAS THAT A PUN? ARRGGGGHHHHHHHH! SANS, YOU CORRUPTED THE HUMAN!"
This just caused Sans and Frisk to laugh harder.
When everyone calmed down, Sans, talked to the human, "I guess this means, we're gonna train you huh kid?"
"TRAINING? WITH THE HUMAN? WOWIIIIIEEEEE!"
Frisk jumped and whooped with joy. This is going to be so much fun!
Some stories might be this short, so if you want me to continue a particular plot line, then go ahead and tell me :)