all the stories of someone protecting a human is usually an angel, or a hero, right? but in this case-screw heroes, lets just focus on the concept of angel's protecting humans at all cost...but what if a demon did this job? then they realized that this person is different-they can see the demon.
Rory was walking around, in the city, Rowan following her. He was walking behind her, looking around but his main focus was Rory. She was like his little guardian angel but as a demon, and she didn't know about him.