Frisk just wants Sans back. After Chara forced her and Sans to fall through the hole in Mt. Ebott, something happened to him. He's not here anymore, but this stranger claims to be both Sans and Dr. Gaster. Together, they continue through the underground, hoping to keep Chara at bay and find a way to bring back Sans. But what if they can't bring Sans back? And what if Frisk falls for this stranger? Adult!Frisk x Sans Adult!Frisk x Gaster!Sans

Ah....another year at Hero High. The birds are chirping, everyone is happy to be here..... Pft. Please. Not so-welcome newcomers New classes New students And new crushes..... This is a whole new year for the students, and for some it may be their last.........

Here is a story where I read the monstrosity called....Moon daughter by XxxMoonlitexxX