Toriel shamefully helped Temmie with the stove after she was regurgitated back out of her body. All of her attempts to get Frisk to stay have failed. Frisk was filled with so much determination that Toriel had no choice, but to let the knife-wielding child go on her adventure throughout monster territory. She gave Frisk a hug and went back inside.
Toriel then decided to relieve a lot of her pent up stress on her husband Asgore by taking him from his location and forcing him to massage her feet, not caring about the story plot for the moment.
