(You can play any bad sans)

You were mainly just walking around the castle, looking for something to do. You were opening random guest rooms until you opened this particular guest room door. You saw Killer playing with 3 kittens. You remember Nightmare saying ABSOLUTELY, no pets. Killer shoved the cats under the bed.

"uhhh.. It's not what you think it is..?"

Killer's soul was in stage 1. And Nightmare would happily 'FIX' that soul and change it into a stage 2. Will you tell on him?