Underswap Gaster x Daughter! Reader

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"B..blue? Papyrus..? Are you guys out here?" You asked as your (f/c) sneakers made the snow crunch. You had a very powerful Justice soul. You could summon huge guns as well as bones and blasters. You keot looking around when you heard a flapping sound. You looked up in a tree and saw something blue and orange.

Your soul stopped for a second. "no..." You used your magic to grab the blue and orange items and bring them down. It was Sans's blue scarf and Papyrus's hoodie with a cut through the chest. "No... nonononononono!" You gripped the items as yellow tears formed.

"I.. I trusted that human... I... I will kill that human, if it's the last thing I do..." You said the last part with a deep growl as your yellow eyes started to flare. You got the hoodie and scarf on before teleporting to the Judgement hall. You didn't see someone watching as you saw the human walking into the hall. You glared at the human as your yellow eye glowed deeply.

"Why did you do it? Kill not one, but both my brothers? Papyrus was fun and kind, Blue or Sans was the most innocent thing here..."

You summoned a pair of large guns and blasters as your hand glowed yellow. "I WILL SHOOT YOUR HEAD OFF." You growled as your large guns fired, the human dodged them before you snapped and bones went after them. You kept killing the child while hearing someone say,

"❄☟☜✡ 👍✌☠☠⚐❄ ☼☜💧☜❄ ☞⚐☼☜✞☜☼📬"

You were starting to get tired as your guns started to fade. The human saw this and decided to attack. Your eyes widen to someone else getting in front of you. You saw your... your... your father having the human in the air.

"So you think it's funny to hurt those around you? Then this is going to be hilarious

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"So you think it's funny to hurt those around you? Then this is going to be hilarious." In seconds the human was dead before Gaster lowered himself to your height since you were on your knees. "D..dad..?" You said as yellow tears swelled up in your eyes.

"Hey, don't cry. It's ok." Gaster said as he placed his hand on your skull. "B..but how..? You... you..." "I know it seems impossible but, I'm always here." You stared at Gaster as he smiled softly. "Just remember me ok? Never forget." You nodded before a reset came. You woke up to Blue banging on your door.

"(Y/N)! GET UP! WE HAVE PATROL!"

You smiled and sat up, you stared out your window to see peaceful Snowdin. "Yeah. I'll be there Sans." You said as you walked over to your closet. You pulled out a (f/c) jacket you haven't worn in years before putting it on. "(Y/N)!" "Coming!" You raced out the door to meet Sans and Papyrus for patrol.

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