Blue Soul (Sans x Reader)

Its been 10 years sense the magic barrier broke, and Frisk has settled down with their lovely human husband. But nothing goes exactly how everyone plans. 3 months into the pregnancy, their husband dies, leaving Frisk with her mother Toriel, and 6 months later, a baby is born, but not everything is as it seems.

(reader is frisk's child, AU that toriel can see people's souls, Alpyus x Undyne, Papyrus x Mettaton, will add more later on )