When her father has to go out of town for an emergency at the last minute, he tells his client/partner/colleague(s) who had been staying at his place to feel free to stay and make himself(/themselves) at home. When he said "what's mine is yours", he never intended that to refer to his teenage daughter... but his guest(s) decide to be very literal, and spend the entire weekend making good use of his daughter all over the house.
Looking for the guy(s) for this line, but I have plenty of other ideas up at my journal and I'm looking for short term/long term lines.