He turned to the child meaningfully as the door closed, his eye sockets already turning black. His typically playful smile appeared menacing. Frisk wanted to run.

"It's not working, kiddo. We have to try again." His skeletal fist clenched tightly and he began to pace the floor of the house. He shouldn't have known it as well as he did.

Frisk was silent. She stared at the ground and bit her bottom lip, chewing until she could feel the satisfying rip of her skin and allow a drop or two of blood to spill through. She didn't want to answer. She would not. She would ignore Sans and his ridiculous notions until he realized the implications of his request.

"Frisk? Are you listening?" His pacing stopped and he faced the young girl. He was barely taller than her, but it felt like he was towering. 

"I heard you," she said, teeth still piercing her tender skin. It hurt. It hurt just like she wanted it to.

"Well? I don't feel like waiting all day," he continued, hands shoved in his pockets. He was far too casual. Frisk's fingers twitched with a long suppressed urge.

The house was quiet, so quiet that she could hear the creaking sounds of the house settling. Frisk inhaled deeply and uttered the weightiest words she'd ever needed to say.

"I'm not doing it."

She braved an upward glance, catching the blue to yellow flash in Sans' left eye. In fear, she stepped backwards, allowing her fingers to wrap around the top of the chair in front of her. She pretended it could protect her.

"You're joking, right?" Sans asked without a shred of humor in his voice. "You're trying to tickle my funny bone, huh? Lemme tell you, kiddo, it's not very funny."

She wanted to abort this mission. She wanted to run and hide and do whatever Sans asked of her. She wanted make him happy, no matter the cost.

But she couldn't give into fear. She had to stay determined. For her sibling's sake and Mettaton's sake and her own. If she backed down now, everything she'd done would be useless again.

"I, I'm not joking, Sans," she mumbled in a wavering voice. No, Frisk, confidence. Be confident, be assertive, be determination incarnate. "I'm not joking at all," she firmly restated.

Sans laughed a dry, bone-chilling laugh. Frisk hadn't heard that in quite a few timelines.

"Some sense of humor you've got, kiddo. Now c'mon and stop acting like a brat." He stepped closer, extending a hand to Frisk, presumably to shake. She wanted to spit on the bones that reached towards her.

"No, Sans," she paused to gather her thoughts, "You've forced me to do this for way too long." Her heart pounded roughly in her chest.

Ba-dum. Ba-dum.

"What did you tell me?"

Ba-dum ba-dum ba-dum.

With conviction that she barely knew she possessed, Frisk insisted,"I'm not gonna reset again. Never again. You can't make me."

Ba-dum ba-dum ba-dum ba-dum ba-dum

He stepped forward angrily, retracting the offered hand of peace. "Do you have any idea what you're saying, kid? Don't you remember our agreement?"

"I know, Sans, I know. But seeing them like this, constantly resetting, it's killing me!" Frisk appealed desperately to him.

"Well now you know how I felt when you did this to me! Suck it up, kid!" His eye burst into a bright blue flame and Frisk cowered instinctively behind the chair. With a wave of his hand, it flew across the room, leaving Frisk terribly exposed.

With fearful tears in her eyes, Frisk continued arguing, "They're in love, Sans. Can't you see it? They're in love now, just like they were last time, and the time before and the time before and like they've been since you first forced me to reset!"

"That's what you need to fix, Frisk! That's your end of the bargain, in case you forgot!"  Frisk tried to move but found herself completely immobile.

She struggled against the unseen force to choke out from her constricted throat, "They're happy! I, I'm happy for them! Why do you have to b-break them up?" It became increasingly harder to breathe, and she felt panic take hold of her.

"Because I love (Y/N)! You wouldn't understand, you little brat," Sans spat hatefully, releasing his grip on Frisk the slightest amount.

Frisk gasped for the breath that she had lost before whimpering, "Then let them be happy. You don't love my sibling, you have a sick obsession!" The accusation may have been harsh, but she believed it with everything in her.

"How dare you say that?! You know nothing! Nothing at all!" Another chair skidded from the dining room to the living room.

"I know enough to know that this needs to stop," she argued, "I can't deal with these resets anymore. Everything is changing and I'm the only one who remembers what it was like. I'm not resetting again. Please, Sans, please don't make me. Don't-" Her pleas were abruptly cut off by the same force that held her in her place.

He sighed, frustrated, "Fine, don't do it. But I'll find someone else. That flower may have pollen for brains, but he can follow simple instructions. I bet he'd enjoy it." He released the grip he had on her from afar, allowing her to move around again.

"No, no, please, you can't trust Flowey," she stammered,  "He'll ruin it all. Please."

He laughed darkly and without humor, "If you care so much then do it yourself."

"If you get him to reset, I'll, I'll," Frisk stopped, at a loss for words.

"What'll you do, kiddo?"

She hesitated. The familiar voice whispered to her, "Stay determined." Chara shouldn't have been there. They were supposed to stay in the Underground. They weren't meant to be with Frisk.

"I'll make them do it again."

"Do what?" Sans nearly scoffed at the child's bluff.

In a sudden burst of confidence and some inward spirit she let out a cackle that was barely her own. "Don't pretend you don't know."

"Listen, kiddo, I don't know-"

Another chilling laugh, "Papyrus was especially fun." She wiped a thin trail of blood leaking from the corner of her eye. "He believed so much!"

His pupils went wide, any intimidating demeanor immediately disappearing. "You wouldn't. Frisk, you know you can't."

A self satisfied grin cracked its way across her face, "I most definitely can. I will."

Sans almost desperately mustered all the gumption could to provide his same, empty threat, "Then I'm gonna have to give you a bad time."

Frisk laughed hysterically, ignoring the pleading whispers of Chara, begging her to stop, begging her not to force them to do this, insisting that this wasn't what they had meant.

She didn't care anymore.

"Sans, you might give me a bad time," she paused in order to chuckle evilly again, "But I'll give you hell."

For the first time since Frisk's first reset, Sans felt something awful. It was fear. Pure, sick fear, making him worry that he would vomit. He wanted to do anything besides stare at this girl who had been so pure, so kind. Frisk was not alright. She was twisted, cruel, and Sans didn't know why this was showing again.

Frisk, or what had been Frisk, giggled and continued, "It's been quite a while since I've seen you so scared, Sans. What is-"

The sound of a car pulling up in the driveway startled her to silence. Quickly, she dashed away, leaving Sans alone and terrified as the person he loved entered hand in hand with the one he hated.
_________________________________________
A/N: The sequel to Flip My Switch is out now!  Introducing Hold To Reset, a terrible, terrible mistake.

If you want fluff or a happy ending, this isn't the sequel you're looking for. You can exclude it from the FMS canon if it helps you sleep at night.

So, go on and hop on over to my profile and read the first chapter of Hold To Reset. It's the sequel that literally no one asked for.

What a wild ride this will be.