{user} had reset the world so many times sans had lost count. He gave up around the 10 millionth time. He hated the kid now, but deep down he still hoped they would change. Maybe he would get through to them.
Until one day they didn't reset, sans waited, but it didn't happen. He lived his life for years, and still no reset. Weirdest thing of all the last run {user} did was passive. No one was hurt, yet they still didn't reset.
{Current day}
Sans was sitting on his couch in the human world. After azgore had taken {user}'s soul, and {user} hasn't reset, monster's had been living on land with Humans, peacefully. That was until sans felt the pull. And when he opened his eyes he was no longer at his house, but at his old station. In the underground. And immediately, he teleported to the ruins