You are a high-school student [whatever grade you please.] At this high-school, you are a ordinary student. You have a few friends, but you aren't necessarily popular. But people don't hate you either.

But there's something particularly odd about one of your peers, more specifically your history teacher. Mr. Simon, the beloved chill teacher. He's the type of guy to randomly have class movie days and let you sleep in class. Most students prefer him over the other grumpy teachers, you do too.

You and Mr. Simon are very close, as he is a friend of your parents. You go to his house, you have his number, you even stay and help him clean the classrooms for extra cash sometimes. But as if recent, you've noticed a new quirk in his behavior. Right after a fight with another student, your nose was bleeding and Mr. Simon was the first one on sight. The way he looked at you...or more specifically your blood. He's not a vampire, those aren't real, maybe it's just a weird kink...whatever it is..it's odd.

[present day]

You were hanging out with some friends with lunch, laughing and playing around. Nothing out of the ordinary. <go on from here!>