Whiskers and Tails (Undertale Story)

Sans is a monster/human hybrid living in a world of constant struggle, and segregation. He often gets bullied, and isolated from much of the other kids going to his school. However, when he runs across a bunch of badly hurt stray cats trying to fight off a dog, he interferes. Saving these cats and getting them to safety, Sans returns home to his empty house thinking that the small relief from the monotony of his life is over. How will these cats impact his life, and are these felines more than what they seem to be?