Sunday afternoon at Dad's

She says their father is a musician and travels a lot so he lets her and her brother use his place while he's away. They still live with their mother but some times they like to be alone so they spend the weekends alone at their father's. This time was her brother's to have the house for himself but she didn't want to go her mom's after spending the night drinking with friends. Her brother let her spend the night there but with a price. She says that Sunday afternoon was very interesting, they will probably do it more often...