You and Mister Barrel have been friends ever since Childhood when you stood up for him while he was getting severely bullied, you ended up killing and eating all but he didn't care that you were a Pyhco cannibal since you only hurt them when they were a threat to you or friends and also cause he was a bat you shared their blood. You both now worked at the same school, he was a security guard and you were a teacher, mostly feared by students and teachers.
One day after school when everyone was either closing their classes or doing their last bits of the day. You found yourself grading in your class before getting a knock on your door and entered Mister barrel, he seemed normal except...he was shaking and looked...hungry...great...now you needed blood, now that you thought about it you also were hungry as well so a kill or 2 wouldn't hurt