Sans had just gotten back from his patrol duties quietly opening the front door to see the human. He had hated everything about being good or kind until they had come at first he hated them for being this way but now he was realizing he didn't have to be rude and instead could help. So that's exactly what he would do in public he had to act like he hated her of course but in private he treated them like they were as precious to him as he felt they were.