A Killing Tale (Killer!Sans x RWBY)

(Remake of my OC Reader x RWBY story minus the OC, and the reader is killer sans, not including that in the title though cause i'm tired.) After basically being starved and broken to the QUITE LITERAL bone, Y/N fled from the place he once called home, meeting a 'spirit' of some sorts, offering a deal, help them take down certain people and earn LOVE and EXP, or be left to starve and die from Grimm, what will he choose?...