Disclaimer: I do not own Undertale, it is the property of Toby Fox
Sans stood at the end of the Hall of Judgement. Facing him on the other side was the kid, no, demon who has killed his brother and friends. Now he was the last one, he knows what will happen once he fails. He thought "What if the kid does not reset, what if they never reset." They walked towards him as he gave his final warning. Then he attacked, they dodged the blasters and bones perfectly, never even getting hit once. Sans expected this, he still remembers the hundreds of times they fought against one another but could not remember the details, his memory has been fading lately. As they doged attack after attack, Sans recollected the events of this reset. As Chara made their way through The Ruins killing everything that moved, Sans rushed to warn Asgore. He immediately went to Snowdin to stop the kid but it was too late, they have already killed everyone. Asgore went into a blind rage attacking them but they were too powerful. They struck down Asgore like how they killed his brother and so many others. As they made their way through Waterfall, they killed Undyne and Monster Kid without doing so much as flinching. Then they killed their way through Hotland and The CORE finally reaching him. After many turn of attacking and dodging, Sans offered the mercy option. Surprisingly, they accepted,as Sans thought "Will this kill really be that easy, they know that i will kill them." Bones went through their body, killing them. Sans closed his eyes bracing for a reset, after what felt like a hundred years, he opened them. There was no kid, he waited even more, but no one came. This was the end, the very end.