Undertale AU Sibling Oneshots

Underfell! Alphys x Brother! Reader

(unless stated, it is now a personal headcannon that with any underfell alphys-sibling(outside of adoption), the reader has snake-like qualities. :3 )

Requested by the lovely NingningPurple22!~

You expertly ducked as Alphys threw yet another file at you, which you, without complaint, merely scooped up and set on the nearest table.
"You idiot! These files are all out of order!"
"Don't ssstart with that! I put them back where I got them!" You shouted back, "Besssidesss, maybe if you didn't throw them at me, they would ssstill be in order!"
"Alright, alright, dears!" Mettaton, with his fours arms, quickly scooped you both up and held you apart. "That's enough, how about you two take a break, hm? Go out and enjoy yourselves, I'll reorganize the files for you."
"You can't organize shit!" You both snarled at him, but quickly complied with going out when given his famous murder stare.

Of course, you went on to Snowdin as Alphys stopped in Waterfall.
You were craving those sweet, sweet cinnabuns anyway.
As you were coming up to the shop, you hadn't noticed the figure in the alleyway as you reached into your pockets to check if you had brought any money.
Suddenly, you're face-first into the snow, the heckling laughter around you making your nerves shoot up again.
"Hey look it's the lizard!"
"What's he doin' here? Shouldn't you be back in the lava rocks, scaly?"
You yelped as they pulled you up in the air, gritting your teeth and trying to bite them.
You weren't exactly the tallest or strongest, a lot like your sister in fact. They laughed at you again, only to drop you the moment a few bones flew past them.
Groaning as your face hit the cold snow again, you didn't have time to pick yourself up before someone did it for you.
Oh fuck it's Papyrus.
You prayed he would take the blush on your face as you just being cold.
"What are you doing all the way out here (Y/n)!?"
"M-Me and Alphys got into another argument, s-ssso I came here to take some time away."
Papyrus hummed at you, looking you over.
"Well, you don't seem hurt! Come, you will stay in my house until you are warm enough to return to Hotlands." And without waiting for an answer, he promptly flung you over his shoulder like a sack of flour before walking.
You quickly dug out your phone and texted your sister.

You: HELP
You: IM BEING KIDNAPPED BY MY CRUSH
Alphys: I don't see the problem?

"Alphysss!" You hissed, glaring at your screen as if she could feel it.
"Is your sister bothering you again?"
"Huh!? O-Oh yeah!" You stammered, watching as Papyrus moved your from his shoulder to the couch.
"Stay here, I will go fetch blankets!" He declared, heading off to a closet upstairs.

You: HELP ME OR I'LL HIDE YOUR ANIME
Alphys: you wouldn't dare
You: IVE DONE IT BEFORE AND I'LL DO IT AGAIN
Alphys: fine! Just survive this visit and I'll help you when we get home!
You: NO HELP ME NOW
Alphys: IM BUSY

Frowning deeply at your phone, and albeit still very salty at your sister. You opened your text chat with Undyne.

You: My sister likes you. A lot. :)

There.
You jumped as a blanket was suddenly wrapped around you.
"Oh... Thank you Papyrus!" You gave him a shy smile, huddling into the blanket.
Papyrus have a smug smile, turning to step into the kitchen.

Alphys: WHAT DID YOU DOOO
You: what I had to

It was a moment before you got a response.

Alphys: one does not simply spill beans on someone without getting some spilled back

Oh no.
"(Y/n)? Your sister just texted me that you like me more than a friend?"
You groaned in embarrassment, burying yourself even deeper into the blanket.
"Damn you, Alphys!"