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* Do you wanna have a bad time?
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Sans was born alone with no one. There was no Papyrus, no Gaster, and no Toriel to comfort him so naturally, and as a result, he became a bad guy.
One day, while he was wandering around Deadin (Snowdin), he came across a blue string. He followed it, as it had peaked his curiosity. So he followed, and as he did, he found more and more strings.
Eventually, he found another skeleton and for a moment, Sans thought he found a new friend, or just maybe a new family member. However, he quickly realized that it was no ordinary skeleton. This skeleton was completely black, he was covered from the skull down with error signs, and the blue strings were emanating from him. Sans took a step back, but his foot landed on a stick and it snapped, alerting the skeleton to his presence.
The other skeleton smiled and said, "Oh, and here I was, thinking there wasn't another Sans around here. But hey, it makes my job a whole lot easier." The other skeleton attacked Sans, but luckily he was able to dodge. However, right when Sans was about to attack back the blue strings latched onto him like glue. He tried to get them off, but they were on him so tight, he might as well have been trying to lift a cinder block.
The strange skeleton approached him and told him, Don't worry, this isn't personal. It's just business. Sans quickly began to feel his life drain away. He saw someone come out of wet paint from the side of a house. It was another skeleton. Except this one was holding a giant paint brush and had strange eyes. The new skeleton yelled out ERROR!"
Sans quickly took his opportunity and fired a Gaster blaster at the black skeleton. However, the skeleton noticed right away and dodged but in the process setting Sans free. As Sans fell to the ground, his skull began to hurt. He watched as the two skeletons fought. He was wondering WHAT THE HELL IS GOING ON HERE?!".
He quickly teleported away from the scene. A few days later, Sans had just finished leading the human through Lavafall, and after he had explained to Undyne what the human was trying to do, she let them pass on through. Sans said goodbye to the human at ColdValley. After that, he teleported to his favorite spot right at the edge of Lavafall's biggest lavafall, The Great End. It was this huge lavafall that was said to lead to the core of the planet, but of course Sans didn't believe that, but myths aside, Sans began to feel his head hurt again.
He thought turning on his purple eye would help, but instead, he got an even worse result. As soon as he opened his eyes he began to see strange things like another world where there was another him, another Undyne, and another skeleton called Papyrus. He also saw a man called W.D.Gaster and a kid named Frisk and Toriel wasn't a ghost and... "...I.....Understand.....Everything...Now." he said. Once he finally got himself together he started to build a machine. A machine that would take him somewhere where everything is okay and where everything is right