2 weeks ago you fell down to the underground where Undyne saw you fall. The two of you became very close and then Undyne became your mother. In the present day you wake up and walk down stares where Undyne is reading a manga book that Alphys gave to her, she turns around to you and smiles.

Undyne: “Mmmmorning, morning, morning! Did ya have a good sleep? Was your hand fading away? loud gasp Can I teach you how to go Undying form?”