If Undertale Met Geno

1: Your.. not.. Sans?

(3rd person pov)
Papyrus was finished training with Undyne and decided to go home and see Sans since he was usually there about this time. While walking home, though, he felt like someone was watching him. He kept looking behind him, thinking he saw something, but there was never anything there. Weird... he thought I swear there's someone there... none the less he keeps heading towards his home in Snowdin. He opens the door to find the house empty. He's probably upstairs Papyrus thinks sleeping most likely... I should check and see just in case. So he does that, but Sans was not there. He checked his own bedroom too, but nothing. He checked the entire house, but he still couldn't find Sans. "Sans!" Papyrus shouts "Are you here?" No answer.

He suddenly remembers about Grillby's. Ah, He thinks Sans must be there! Papyrus then leaves the house and heads for Grillby's, hoping it was still open, and it was. He walks in and looks around, it's pretty much empty other than Grillby. So he walks over to Grillby, who was cleaning the bartop. "Have you seen Sans lately, I can't find him" He asks. Grillby responds, "No, actually, I haven't seen him all day. Which is odd for him." Papyrus sighs and leaves Grillby's. He stands out in the snow thinking about where Sans might be. "Maybe he's still at his sentry..." Papyrus mumbles to himself. So to Sans's sentry, he goes. When he arrives he spies the familiar skeleton sleeping there. But something's off... He walks closer. Some things are different about his brother. His jacket is white instead of blue, and there is a red substance leaking from his mouth. "I hope that's ketchup," He whispers to himself. Papyrus begins shaking 'Sans' while yelling "Sans wake up!" The skeleton begins blinking its eyes open and sits up. They look up at Papyrus and freeze up staring at him. Papyrus does the same, noticing the large slash mark across the skeleton's chest, with a very worried look. "S-sans..?" he says. 'Sans' stays silent. "Are.. are you okay? What happened to you!? Are you even Sans!?" He says in a nervous tone, clearly on the verge of tears. 'Sans' tilts his head down,
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(Geno Pov)
Oh shoot I forgot about him. Maybe this wasn't the best place to take a nap- I can't look at him for too long, I can't just cry while looking at him...
"Sans..?"
Oh lord this is bad.. He thinks I'm just brother.. I look up at him slowly, our eyes meeting. We stare at each other for maybe a minute before one says something.
"Uhm, oh gosh, how do I say this.. " I say, almost whispering some of my words, "I'm not Sans, or at least, I'm not anymore..."
Papyrus seems confused and looks like he's thinking.
Shoot did I say the wrong thing!?
"What do you mean by that? How aren't you sans anymore?" He asks.
"Okay, gosh- uh," I pause, do I really want to explain this? How should I explain it? Isn't Sans going to be here soon..?
"I'm a- uhhh- alternative version of your brother..?"
He froze.. Oh gosh he's staring at me. Maybe he's thinking about what I said..?
"So.. You're not Sans?"