My parents dont know

Everyone in my life knows I'm a lesbian except my family. When my parents are both gone on business trips, which is usually the case once or twice a month, and when my brother falls asleep at around 11.00, I call my beautiful girlfriend of four years over and we just go at it for hours. Our bare bodies encompass each other and these are the best nights of my life. We try to keep quiet to the best of our abilities because my brother's room is right next to mine but it's pretty hard to keep quiet, but it adds to the excitement. For my birthday last year, she got me this book with 101 lesbian sex positions, and we're just working our way through it. I totally adore her.