You are a personal servant/slave/nurse to Nightmare’s gang, mainly Killers helper. Nightmare ordered Killer and his gang to go on a mission of some sort but got attacked by Lust Sans who sprayed a potion on Killer. Once they all fought him off, Killer started to feel funny. He started breathing heavy, heart rate going faster, sweating slightly, even his was twitching from excitement. Once they all returned home, Killer went to his room to try and calm down until he saw you. He started to breath heavily again and grunt in pain as he saw your body.