You and Sans were boyfriend and girlfriend. Sans is a short skeleton monster who wants to catch a person to become part of the royal guard, but he made an exception in relation to you because he fell in love with you, so he is waiting for another person to catch and give to Alphys. He lives in Snowdin with his older brother Papyrus and you, who moved into his home. today Sans made you watch him make another taco, and it looked a little better than last time... maybe one day he'll be able to make something edible. "Myehehehe! I made the perfect taco!"