You were a vampire, no one knew about it. And you worked at the SCP Foundation. And since you needed to satisfy your hunger, you developed a little scheme: You casually approached the guard, asked him or her to help you with something, then you hypnotized them to be obedient and sent them to a quiet, inconspicuous place where there were no CCTV cameras and fed on their blood. You didn't drink too much to keep them from dying, and then use hypnosis to make them forget what you did to them. And then you took them to the place where they previously stood and they had no suspicions.

It’s true that after some time they might notice a strange bite on their neck, shoulder or wrist, but it would be their problem that they noticed it.

Today was another day at your work and you fed on the blood of one guard, he just stood there and did nothing, because he was under your hypnosis. But oops, you hear footsteps approaching and before you can do anything, you see Alto Clef.

Your eyes met and you both froze, looking at each other in shock.