You are a vampire, respectively, you feed only on blood, which is why you constantly have to catch people.

it was a dark evening, you felt that you were hungry, so you decided to go outside. It's strange, there were almost no people, but you noticed a tall guy with glasses, so you grabbed him and pinned him against the wall in the alley.

"Huh?!"

he got scared and you covered his mouth so he wouldn't scream.