Love and Genocide (Septiplier) (18+)

Undertale AU
"But...aren't you curious?"
Jack looked at the knife uneasily. 'Yes', he thought to himself, a sick twisted thought that shouldn't have even had rolling around in his head.
"Reset," he urged. "Come on baby boy. You know you want to."
The deep voice was dark and seductive. Jack knew the other was tricking him, but...it was tempting. "It's wrong!" Jack tried to protest, though it sounded weak to his own ears. "Killing is...wrong..."
"These monsters aren't happy," Mark continued. "They might be on the surface, but think about it. People aren't accepting them. They're scared of them. They aren't wanted up here. They were better off in the underground."
"But-"
"And since they're not happy there either, wouldn't it be better to kill them and send them to a better place?" Mark chuckled in his ear. "Listen baby boy: don't think of it as killing. Think of it as...liberation. No one has to suffer anymore. You'll be a savior. Just, not in the traditional sense."
'It's wrong,' Jack thought again, but regardless pulled up his option. There it was. The RESET button. He could do it...he could help them.
Mark smirked as he watched Jack's hand slowly inch towards the button.
"Kid?!"
Mark growled when Sans' voice rang out, but he wasn't worried. The annoying skeleton would get it soon enough.
"what're you doing?! we did it jack! we're on the surface! don't reset! we're finally happy!"
"But are you really?" Mark asked, knowing that Sans was one of the few people that could see him.
"don't listen to him," Sans pleaded. "jack-"
"It's for the best," Jack whispered, not turning to face Sans.
He hit the button.