I'll find you (spytale sans x reader)

(ok this is my own au spytale! descriptions will be told upin the information page in the first chapter)
ever since the monsters have been freed from the underground, most humans weren't so happy about it. soon enough a war broke out once again, but this time everyonewas left in broken conditions. you and a xouple other teammates were sent on a under cover mission, to infultrate the monster base. but your teammates were shot dead and you were left by yourself. but a sneaky funny skeleton happened to pop by and change your point of view on the so call beasts. so what will you do? will you kill or be killed?