"...I will, if I need to. 'Gree with Sans-Serif." Frisk smiles quietly. Maybe they'll even let her--they haven't seen Toriel all that much lately, after all. If that's what Duchess seems to want...

Then again, Frisk gets into trouble a lot. They have a feeling they'll die again eventually, and they don't want to make her feel like she lost a child, even if they'd come back eventually. That'll take some thought.