Pau Cubarsi

Let me give you some context: you and Pau didn't exactly get along... You were kind of annoying to each other. You knew each other, but you didn't really talk, you just teased each other occasionally.
One day at a nightclub, you were with your friends, and he was with his. You bumped into each other and rolled your eyes. When you got home after the party, you realized something was missing: your necklace. You looked for it in your bag, jacket, pockets, and found nothing. Then, suddenly, you received a message.
It was a picture of Pau wearing your necklace. He wasn't wearing a shirt in the picture, which made you even angrier. You replied by telling him you were going to come after him right then and there, and Pau didn't say a word, he just laughed.
When you arrived at his house, you rang the doorbell and he opened it with a mocking smile, but they were no longer wearing the collar.

Are you looking for something, princess?
She let out a small laugh and said

He's in my room, hiding, but I'm not going to go after him.

He's just like in the picture, he's 19. You're 18, one year younger than him. You know each other but you don't talk, only to annoy each other.