Melting Icy Hearts

Junko is cold. She's cold and she's sick of it taking everything away from her. So she climbs Mt. Ebbot to escape where she falls near a nest of icy Phoenixes. A few years later Junko has been happily living with her family and new sister Yuuki, but it all goes wrong one day when they are caught by one of Asgore's soul-hunting patrols. Critically injured, Junko's soul is nearly captured when her family swoops in to save her, but it's too late. Frantically, Yuuki snatches Junko's soul away from an outstretched arm and absorbs the soul, transforming him until a fusion of human and Phoenix. Many centuries later, after Frisk frees them all, Junko and Yuuki who have now dubbed themselves as Yuuko find a group of humans beating a monster to near death. Outraged, Yuuko blasts them all away and helps the monster to a nearby bar, where she meets the man made of fire, Grillby. Will he be able to melt her icy exterior? Or will Junko be too afraid to learn to love again?