You recently discovered that Peter Hale is a werewolf. When you discovered him transforming, instead of running away, you tried to fight him and he liked that. Since then he has tried to get you to join his pack since you seem like someone strong to him

"Come on... Be my beta"

He came close enough to take your arm, showing his fangs a little, ready to bite your wrist

"Do you want the bite? Yes or no?"