A/N: I only get the gist of underfell...so bear with me
Classic, red and blue where in the sitting in the kitchen, as their papyrus was off to Grillbys.
"I can't understand how you guys can even eat that stuff."
"Oh come on it's not that bad."
"It's so sweet."
"No it's not! Honey is sweet. Ketchup has more of a-"
"Whatever mustard is clearly the better condiment." red said reaching into his coat and pulling out bottle of mustard.
"Uhh" Classic shuddered just from looking at it.
"Hmpf, are the hot dogs done yet!" red said impatiently.
"Just about-" classic started getting read to set a joke.
"I still say tacos are better!" blue said hopefully cutting off another corny joke.
"That doesn't make any sense! The opposite of hot dogs are hamburgers. SO WHY! Do you like tacos, WHOSE OPPOSITE IS CHINESE!"
"What you china say he can't like tacos?" classic said as he start to prepare everyone's hotdog.
Blue groans.
Red snickers. "Miso what you did there."
"We can taco about it late," classic said placing one in front of each them. Blue groaned louder. "the hot dogs are ready."
Red had always felt a little Self-conscious about eating in front of anyone other than his brother. Having to summon magic for a tongue when your a skeleton is always asked about, but these guys were … him, alternate version sure but still him so he shouldn't feel uncomfortable, right?
Taking the first bit, red looked over at the others to make sure they weren't judging, but was confused when they seem to be staring at their hot dog instead. Were they self conscious too, i mean, i wouldn't judge. Red thought before almost choking on the mosle he was chewing. Classic kept staring, then his eye glowed blue illuminating his food before it disappeared and classic started chewing, but that was nothing compared to blue. Whose eyes went hallow and preceded to lift his hot dog and shove it into his socket.
Not wanting to discuss the horrors that ran through his mind red got up from the table and briskly walked out of the kitchen, out of the house and vanished. Landing into his own dimension he sat on his couch staring off into the distance.
By the time papyrus got home red was still sitting on the couch starting off.
"SANS! THERE YOU ARE THE OTHERS WERE GOING NUTS WONDERING WHERE YOU WERE. THEY SAID YOU LEFT SUDDENLY."
"Boss," sans started barely above a whisper.
"ARGH, YOU'RE GETTING MUSTARD ALL OVER THE COUCH, YOU COULD AT LEAST GET A PLATE!" papyrus continued not hearing sans over his shouting.
Sans slowly looked down at his half eaten hot dog and looked back up at his brother who was standing in the doorway with his arms crossed.
"Boss, we underestimated them." red commented in a shaky voices as he glances back down at his hot dog. Underfell papyrus just narrows his eyes at that statement.