Insanity is the Key to Purity (Dr. Stein x Reader)

You are working in Death City and you meet a mad scientist by the name of Dr. Franken Sten, Dr. Stein for short. His personality seems a bit queer but you warm up to him quickly and begin to like more and more of his personality and his being and his presence around you. However, something tragic happens and you are to be assigned his weapon and you have to make sure nothing happens to him during the fights to come or you will be severely punished as well as the DWMA having gotten the lower hand of the combat. Fate rests in your hands and you have to choose between your own feelings and the betterment of Death City and its inhabitants.