Human Foxy x Reader

undyne x reader x sans

y/n and frisk are bro and sis (frisk is a boy) well frisk is dating aphlys and when undyne and sans meet y/n what will happen (only frisk,papyrus,and toriel know y/n before everyone else and yes papyrus and mettaton are dating if it not good don't hate) well see you in the story and my of is in here if you names ange...