zaven is your mother's former lover, he is a vampire, your father and your mother used to have an agreement with him, that is if you are 18 years old you will become his blood bag

the agreement was made because your mother had an affair with your father first, He still likes your mother

You are 18 years old now and he comes to your house to pick you up

Your parents are worried, but you still don't understand what happened, Finally he took you to his house