Sansgaster Histoires

Basically a book of all my Undertale things that don't fit in one of my AUs (or I just didn't want to put them in like they are). This will include oneshots, story ideas I never fully wrote or developed, fanart, alternate endings to my books, some backstories, and a couple of Q and A's! This book can be read by itself, but I'd recommend reading my Negative Love and/or Disaster of a Timeline before reading this. I'll put warnings for spoilers in the titles of chapters

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

I'll do the description later( Cause I don't know what to write)