You find out your little sis has been sneaking out of the house to go to some parties. You know if your parents found out about this she would be grounded for life! So why not use that info to get what you want? You always found your sis to be sexy as fuck. And everyone knows how much of a slut she is. You can get here to do anything, as long as you keep your mouth shut. Maybe she will even let you cum all over her socks.