As Sans slowly awoke from his nap, he looked over to see Papyrus had fallen asleep as well. He lightly shook the taller skeleton awake.
"Hmm...? Oh, morning Sans..." Papyrus stood and stretched with a loud yawn. He remembered having needed to check on something after their visit to the fields, a soft sigh escaping him. "I have something important to take care of before we leave, alright? Don't go wandering off, I won't be long." With that Papyrus walked a few yards off, then vanished completely. Sans laid back on the grass chest down, his arms supporting his head and halfway hiding his face. He muttered to himself in boredom, and to his surprise a faint voice replied.
"Hey!"
"What the..." Sans looked around him, seeing that there were no visible monsters around him. Yet, the voice called out again. He was tempted to get up, but he stayed. "Papyrus said to stay here," he reminded himself.
"Hey, come on!"
"Who's there?" His green pupils became mere specks as a buttercup flower rose a few inches from his face.
"I'm Flowey!" it explained in a cheery voice, "Flowey the flower! Hee hee, you're so cute in this timeline, Sans!" his eyes lost color completely as he watched Flowey.
"W-what?!"
"Yeah! I've met a few of you before, but here... This you is so small! And innocent... It'll be fun when I rip it out of you! And what would your brother think...?" The skeleton began to tremble and sweat as Flowey's face morphed and twitched during his speech. "Tell him and the scientist I say hi~!" Flowey then disappeared into the ground with a bout of hysterical laughter, leaving the distraught Sans by himself. A short while later Papyrus reappeared, a rolled up paper in his hand.
"Alright bro, you ready to head home?" he asked before noticing that his brother was shaking and crying. He kneeled down and wrapped his arms around him. "Hey Sans, shh... I'm here, what happened?"
"P...Papyrus..." Sans buried his face in his brother's shoulder as he began to calm down. "I-is it true...? Is there other... other "mes" out there?"
"Sans, where did you hear that?"
"A... A flower told me..."
"Shit," Papyrus muttered while picking up the smaller skeleton. Anger and panic were scrawled across his face while he held his brother close and vanished from the field. They appeared in Sans's room before Papyrus put him down on his bed and went downstairs.
Later
"No Gaster! I'm not about to explain it all, alright! There are few things left here that I care about and I'm not letting your damn mess ruin what I have!"
"I hate it as much as you do," Gaster sighed. "I don't want anyone to ever know of the horrid things I've done, but leaving the young one in the dark will only cause us more problems. You know that. The only way we can keep him safe and know he's taking care is giving him the truth, so he can protect himself." Papyrus mumbled irritably under his breath, not wanting to admit Gaster was right. After all, if Sans didn't take it well it would only be an act at his expence.
"Sans," Papyrus called, "You can come downstairs now, okay?" The door to his room creaked open as the skeleton shuffled out, enveloped in a large mass of blankets. He made his way to the living room with painful slowness before seating himself on the couch. He was evidently still in shock over it all, though he'd calmed enough to stop shaking. Papyrus hesitantly cleared his throat, looked to the floor and began.