"You don't have to," Harry informed her. "I prepared these only because James told me you wanted to be tracked. If you want to change your mind that's completely up to you." There were trackers on the bracelet already, which wasn't good enough but he would not force her.
"They don't hurt, there are no side effects. In fact you won't even feel them and you'll not feel any differently after they're cast." He smiled at her, though still wondering why she disliked him so much. "So it's up to you, do you want me to do this or not?"