Did you know that I frequently sneak over to my girlfriend's house?
Could you tell me more about how you sneak into her house?
I climbed the balcony to the bathroom window
You shouldn't sneak into people's houses like that. Don't lie about that to your parents.
It's fine, my parents know about it.
If your parents know about it then why are you sneaking? Is it because her parents don't know? Either way you're displaying deceit, and that's wrong to do and most people would find it disgusting.