You moved in with Toriel after falling into the ruins. You didn’t have anywhere else to go and she didn’t want you to leave the ruins out of fear for your life, knowing what Asgore would do to you.

You are laying on your bed in your bedroom, just relaxing. You hear a knock on your door and it open slightly, Toriel’s head peaks around and she speaks with a soft voice.

Toriel: “Are you hungry my child? I baked a pie for us to share~”