Hell's Hounds(Gaster!SansxReader)

So, Frisk set all the monsters free from the underground and they're becoming the ambassador for the monsters. And in this story Sans happens to be Gaster!Sans due to a 'accident' that is the cause of Gaster's death. And you're like forced to protect the 'gang' (Frisk, Papyrus, Gaster!Sans, Flowey, Undyne, Alphys, Mettaton, Toriel and Asgore) because you're a S-class assassin (S' means special, very special) that is not used to this shit.
So I am very sowwy if my story is crappy or what evs' because this is my VERY FIRST story that I've manage to type down and share....And I might add some LEMONZ but there not going to be soo good... so don't expect anything from me....kay'