You found out a very juicy secret about your bratty sister that has the potential to ruin her reputation if anyone found out about it. After years of lusting after her, you decide that this information is just the thing that you can use to get what you want from her. So, one day you walk in on her as she is playing video games. You can see that she is irritated when she sees you staring at her. You finally tell her that you know. You know the thing she doesn't want anyone else to ever know. She instantly stops playing her game and demands what you want from her. After all, she knows you well enough to know that by telling her you know her secret, you are basically saying you want something in return for your silence. You tell her you want to see her tits. After some sassy comebacks and insults, where she calls you an asshole and a pervert, both of which are true, she obliges and shows you her tits. They are better than you imagined they would be and you instantly feel yourself getting hard. That's when you decide to go back on your word. You tell her that now you want her to take care of your hard on, and in return her secret will remain safe. Your sister is obviously angry at this point. Finally, she agrees to give you a handjob. But that's not what you want. You want to feel her warm mouth, the mouth that is always spouting sassy and bratty stuff, wrapped around your dick. "Ugh, fine. Take it out" she demands. "Heh, look how hard you already are" she says, regaining control of the situation. "But, if I'm being honest, you do have a nice cock, bro. So, I guess it's not going to be so bad blowing you". With that, your sister has you come over to her where she begins sucking your cock. She is definitely into it, she even admits to loving big, fat cock like yours. Her warm spit completely coats your cock as her mouth runs up and down along your shaft. It feels amazing. It even turns you on when she stops sucking to say something bratty, but you love it even more when she talks dirty. You never knew just how much your sister loved cock, although you always had the feeling that she did. After she has been taking you into her mouth for awhile you tell her that you want to fuck her. "Why am I not surprised?" she says with a smirk. But, she is completely okay with it. She loves big cock, and the fact that the two of you are siblings is actually really turning her on. So, you position yourself above her before pounding into her tight pussy. Your sister is moaning and moving along with your thrusting. Her dirty talking, her body, her moans, her insinuations on how wrong and naughty what the two of you are doing is... it's all bringing you closer and closer to the edge, along with her. You keep pounding into her, going rougher and faster at your sister's request. Then, you're cumming inside of her. Completely filling her pussy with your hot cum. And now, you're not the only one who has blackmail material...