This story takes hold when blue came to UNDERTALE where sans lived blue was stuck because the portal or somehow the magic to traveling to other universes is broken or somehow something happened to it if they tried to travel while it's broken they will be EXTERMINATED FOREVER WITH NO TRACE OF YOUR EXISTENCE while at this sans felt really off because he would be looking at blue every time while blushing and gets jelouse when people came close to him even his own brother find out if you want to see what happened and also thank you ANIMELOVER9191 for your oneshots yandare sans x blueberry inspiration and keep on writing
14 parts