Sam the "exchange student"

Sam, exchange student.
• You were sitting at a lecture at the university when suddenly the director comes in
Hello students, we have an exchange student coming to us, so please have some respect. This is Sam. I hope you'll be friends with him.
The lecture started, you were walking down the university corridor when suddenly you bumped into Sam
Sam: You should have been more careful.
•Actually, it was you who knocked me down, idiot.
classes are over, you come home and see Sam and his mom having tea
Mom, what the hell is he doing here?!
• Sam is an exchange student, we decided to help the mayor, and now he will live with us
Sam looked at you with a funny face.
(In fact, he is a witch hunter, and you are a witch who has acquired a familiar, Alisha, but no one knows about it)
(You are a girl)