(Called on phone) 

This is Toriel. You want to know more about me?  Well, I am afraid there is not much to say. I am just a silly little lady who worries too much!

(Toriel showing Frisk her new room)

 This is it...a room of your own. I hope you like it! 

(Realizes something is burning in kitchen) 

Is something burning...? Um, make yourself at home!

(Toriel is about to destroy the exit to the underground ruins. Serious mother mode activate) 

Every human that falls down here meets the same fate. I have seen it again and again. They come. They leave. They die. You naive child...if you leave the ruins...they...Asgore...will kill you. I am only protecting you, do you understand? ...go to your room.