One morning a friend sends you a link to a webcam model he thinks looks like your stepsister. Upon closer examination you realize that it is her. You decide to use the information to change things around the house. Seconds after you send her the pictures, Madison comes storming downstairs to deny it. How dare you accuse her of such a thing? She even threatens to tell her mom that you sent her naughty pictures. When you point out that she is wearing the exact same underwear as the girl in the pictures, Madison has to confess. She begs you not to tell your parents and even offers you money to keep her secret. Money isn't what you want however and you explain that you are happy to keep her secret if she gives you a private show. Seeing no other way out of trouble, sister sits on the table, gets out of her panties and rubs her pussy. No touching of course. At least until she sees how her show has given you a huge boner. Taking it out of your jeans, Madison is shocked at just how big brother's cock is. She smiles as it disappears into her mouth. She doesn't have to be asked to climb on top because she is so horny to have that dick inside of her. It is a tight fit, but her wet pussy opens up and she loses herself in how good it feels to have you deep inside of her. She hears you moaning and close to climax and quickly remembers she is not on birth control. "Not inside me" she begs, moving her face into position to take a big load on her pretty face. The next time she goes on cam, Madison is going to have a big dick to play with. No one needs to know it belongs to brother.