Sorry for not being active 😔 I've been feeling crappy lately. Not very long... and it's old. Sometimes I wish I could have close sibling bonds, so I write reader inserts with the skelebros lmfao
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"why are you such a... a coward?!" 1-S is angry, storming up to you and poking you in the sternum with a finger. He's looking up at you with a frustrated expression, eyelight ablaze. You shuffle backwards a few steps, stammering.

"BROTHER! DON'T CALL HIM THAT!" 2-P scolds with a worried expression. "YOU CAN'T BLAME SIBLING FOR BEING SCARED! YOU KNOW WELL HOW SCARY HE CAN BE!"

"yeah, but that doesn't mean sibling can't stick up for themselves. you're always letting him push you around! you're letting me push you around, even though i'm obviously the weakest!"

"I-I'm sorry...! I-!"

"you're always avoiding problems instead of trying to find a solution! get it through your thick skull that he won't treat you any better until you stick up for yourself."

You feel tears gathering in your empty sockets. "Well I don't see you tackling any of our problems head on, Mr. Self deprecation! You're always saying such... bad things about yourself! And you bottle everything up inside of you;" You poke him back on the sternum, but with a bit more pressure. He stumbles back a bit. "-And you keep it there until you can't take it anymore!"

"well maybe i wouldn't if you weren't such a crybaby!" He suddenly blurts, and you feel more tears gathering. That struck a soft spot and he knew it, and his expression softened a bit. He looked like he was about to apologize, but you yelled back.

"sorry, I-"

"Well, this crybaby doesn't want to talk to a liar!"

1-S stares. He seems almost as heartbroken as you did just a moment ago, before he clenches his fist and turns away. "well, this liar is tired of having to hear your whining all the time!"

"1! 3! PLEASE STOP FIGHTING, THIS WON'T FIX ANYTHING!"

"You don't understand, Bro! You're always too optimistic! A smile and a hug isn't going to fix everything!" You huff out, trying to hide your own tears. You weren't a crybaby! You weren't!

...you were. Sniffling, you shuffle to the corner of the cell and slouch down on it, trying to stop your pathetic crying.

"W-WELL, FINE! SEE IF YOU GET MY GREAT HUGS ANYMORE!"

"fine!"

"Fine!"

"FINE!"

Gaster finds all of you in opposite corners of the cell, refusing to speak to each other.