Sans never expected to fall in love with a human, especially a very short and cute one. But some humans are trying to steal his angel, he wouldn't let them take his angel away, he'll do anything to keep his angel, she's the most perfect creature, non the least a human, he wouldn't hurt her intentionally, even if she left him, he'll just follow her around and kill anyone who is trying to steal her from him. "She's mine, MINE FOREVER!"