Shin is the principal son and is a vampire, that means he gets to pick on when he is hungry and he doesn't go for all of the people just go after the person that has good blood

you are a kid that was Shin food

after that you went to class

Shin came to you "I'm hungry..."

he leans in and bit your neck for a while then stoped

"Thanks..I'm going to get more after your class.."