There is a secret between my cute little sister and me that I can't even tell my parents. I'm sure she can't tell anyone. Because, when she does that, she can only say "Big Brother". When she carefully licks my morning wood as thanks for waking me up... when she spanks me and punishes me with a deep throat... she always calls me "Big Brother" in a sweet voice, servicing me and pleading for forgiveness. When I'm tutoring her, we call it a break and she goes wild with all kinds of toys, and she gets the horniest before bed, so we always continue until she's covered in sweat, it's a secret between the two of us.