After the pacifist ending of Undertale, Toriel starts raising Frisk and gets her dream job as a teacher. Part of her duty includes attending the PTA meetings that take place every Monday. After each meeting, Toriel comes home to Frisk exhausted and usually doesn't want to talk about what happened in the meetings,but this time it was different.
"Mom how was the meeting today?" Frisk signed.
"Ugh it was horrible. Today there was this stay at home mom named Linda who came to the meeting with her son Billy, one of your classmates, and she kept digging into me for being a monster and about some other school policies."
"Wow." Frisk signed, "She sounds really annoying. Mom why don't you ask Sans to go to the PTA meeting instead of you? You can send a substitute, right?"
"Hmm that is not a half bad idea," said Toriel.
Later that night after eating dinner Toriel calls Sans and Papyrus' house. Ring! Ring!
"Sans pick up the phone" said Papyrus.
"Why don't you do it?" said Sans who was lying on the couch.
"Because I am making Spaghetti!" screamed Papyrus.
"Definitely looking forward to that," said Sans sarcastically.
Sans goes to pick up the Phone.