Jenn had been making the bed when Emry interrupted her, she tried her best to mask her annoyance at his presence. It was extremely unprofessional of her to be jealous of the boy, they were both merely possessions of their Master, objects for his use and pleasure. She was being selfish in wanting Mir to herself but try as she might she could not get past this, her Master wanted Emry so that should have been the end of it but it wasn't.
She finished making the bed before looking at Emry, she was quick to be irritated by the boy. She was not his slave and didn't need his permission to go and make them lunch.
"No, you'll only mess things up" Jenn said dismissively, her dislike for him was irrational but unavoidable it seemed.