"Promise me one thing- just one thing only." Frisk nodded vigorously. "No one can know about this whole reset thing. Not Papyrus, not Asgore, not anyone. It would basically bring this world to the point of falling to pieces at our feet. If we weren't trapped between time and space already, very few of us wouldn't be able to handle that knowledge, and could drive those who couldn't to the edge. So, please. I'm begging you. When you reach the End, when you get us out of here for the umpteenth time, I don't care if you reset or not. Just don't tell anyone about it, and... Please don't go homicidal again, okay?" Frisk smiled meekly, and nodded. "I can do that. And don't worry about the reset." They gave Sans a small hug. "After that whole thing with Chara, there won't be any more." And with the final word, they opened the door to leave; before exiting they paused. "See you later."

Sans has lived through countless timelines. He's seen the kid make friends with everyone, only to give up in the final moments. He's seen the kid killed, over and over and over again. Sometimes, he'd even done the killing himself. And no one ever remembers. Not even the kid herself. It's an exhausting cycle, one that never seems to end. But there's something different about this run. Another human's fallen down... the kid's sister.

Just a bunch of Sanscest one-shots for you narcissistic self shippers.