Dude seems like he's a dad chastising his daughter for having sex. Maybe thats the problem, their whole relationship took a paternal role and she just see's him as an authority figure that takes care of her. She snuck around because thats what kids do when they have strict parents. Look at her posture, she got her shoes on her own furniture, that tells you don't respect the household like that. like a spoiled teenager who didn't pay for anything.