Undertale AU Sibling Scenarios

Yandere Swap Bros X Kidnapped! Reader

BECAUSE EDGY IS WHAT I DO BEST >:)

Feel free to change the design! Also requests are closed for a little while.

Like Sans, you were very bubbly. You were also popular on (preferred social media) for (activity). Yet your brothers noticed something in the thousands of comments on a post that you didn't see.
It was subtle, you wouldn't have noticed it, but your 'overprotective' brothers saw it clear as day.

(Insert inconspicuous username):
"This post is great! Wish we could meet and talk..."

You being the bubbly, and slightly oblivious girl you were, would've saw this as just another fan. But your brothers, red flags and warning signs flew everywhere for them. They don't have the most...sane idea of dealing with a person who hurts you. Yet they weren't prepared for what would happen to you.

You were walking home from the store - you were getting low on snacks at the house - and couldn't wait to get home. A few fans saw you and squealed before running over, chatting for a bit before leaving, squealing some more.  When they left, you put on some music and listened through your headphones, humming along. You were almost home when you were suddenly grabbed and knocked out.

-Time Skip-

Your brothers knew you were going to the store, but you weren't back yet. It's been a least an hour, a quick trip to the store shouldn't take that long and if you were running late, you would call. Papyrus was sitting on the couch staring out the window. He growled slightly as he fidgeted in increasing worry. Sans was in a similar position. He was in the kitchen making tacos, but he worked faster and made more messes than normal.
Something was wrong. Very wrong.

You awoke to find yourself somewhere dark. You were tied up it seems.
"S-sans? P-Papy?" You called out, shaking as tears started to form. Then someone emerged from the darkness. You couldn't recognize them.
"W-who are you?" You whimpered. They chuckled.
"Just a fan. Sigh, such a pleasure to meet (Y/n) from (social media)!~ Finally Senpai is all mine!~" They said. Tears fell down your face.
"Oh don't cry! Here why don't I go get you something to eat? Maybe that will calm your nerves!" They said, before descending up some stairs and into the light above you, closing the door behind them. Quiet sobs escaped you as you quickly used your magic to break the ropes. Glancing around, you saw the groceries and your phone over in the corner opposite of you. Grabbing your phone you quickly dialed a number.

Sans:
Sans finally got fed up and set out to find you. Sans had double checked the kitchen wouldn't set on fire before he left, taking a weapon with him and making sure it was hidden. He didn't answer as Papyrus questioned him. After looking for a while, Sans' phone started to ring. Seeing it was you, he quickly answered.
"(Y/n)?!"
"S-s-saaans! I-I'm scared!!!" You whimpered in a hushed whisper.
"Where are you?"
"I-I d-don't know, s-someone kidnapped me I think...."
Sans' eyelights went out, a dark aura around him. He was about to respond when he heard your screams on the other end.

Meanwhile, the person who had kidnapped you had caught you on your phone.
"Such a shame. And here I figured you'd behave and stay put." They said, taking your phone and tossing it back onto the table. You saw your chance and shoved them into the table, hearing them grunt in pain as their gut hit the table. Quickly snatching your phone, you ran up the stairs, forgetting about the groceries. You heard them follow you as you ran around practically blind in their house. You turned a corner only to find a dead end hallway. You were about to run back out when you saw them behind you. You panicked and backed up as fast as you could, your back soon meeting the wall. You screamed before they knocked you out again.
Before they could tie you back up though, a bone sliced through their torso, pinning them to the wall. They looked over to see Sans. They shook when they saw his small, creepy smile.
"So, you think kidnapping my sister would have no consequences? You thought wrong! Now, what to do with you? Hmmm," Sans tapped his chin as he took out a butcher knife, before continuing cheerfully, "I know!~ Off with your head!"
(If you get the reference I'm making I will freaking love you)
The person screamed before Sans slammed the knife through their neck, watching their head and limp body fall to the ground.
Smiling, he picked you up carefully and walked out of the house.

You woke up in your room. You sat up quickly before noticing Sans walk in.
"Sans!" You exclaimed before hugging him tightly.
"It's ok, (y/n)! Nobody will hurt you ever again..."

Papyrus:
Papyrus then suddenly got up and walked to the door.
"Pap? Where are you going?" He heard Sans ask.
"I'll be back..." he growled, walking out. Halfway into Snowdin, Papyrus' phone rang and he noticed it was you.
"Where are you?" Papyrus asked.
"I-I d-d-don't know...um...hold on t-there's a w-window..." you muttered. He heard you shuffle a bit.
"Um...oh! I t-think I s-see you...y-yeah! I-I see you...it's the building d-directly across from you! I-I g-gotta go I think he's coming back..."
"Don't eat anything he gives you." He replied, starting to walk towards the building.
You quickly hung up and put your phone back before going back to the corner you were in. When the stranger came down with a plate of food they looked at you questioningly.
"T-the...uh...r-ropes...uh...w-were h-hurting my wrists..." you muttered, hoping you'd fool them. They gasped before starting to apologize before there was loud banging on the door upstairs. They sighed.
"Here's the food I made you, hope you like it." They said with a wink before going upstairs. You soon heard fighting and then someone coming down the stairs to the basement.
"(Y/n)?"
You looked up to see Papyrus, his hoodie covered slightly in blood and dust.
"P-Papy!" You exclaimed running to him and hugging him, not caring about the blood and dust on his hoodie. He hugged you back before collecting your things and teleporting home.
He set you down on your bed, hesitating before letting you go.
"Nobody will ever dare think of hurting you again..."