Blackmailing Your step-Sister

You walk in your step-sisters room unannounced and uninvited, while she's changing.. but she notices you had your phone out! You aren't so sly... she takes it and finds out you were filming her! She threatens to tell step-mom and step-dad what a freaky perv you are but you tell her if she does... you'll tell her boyfriend about the video... a different video of her sneaking a guy from another school into her room. Your step-sister begs and pleads and even offers you money to delete the videos and not tell anyone. It's not good enough and you want something else. She's angry and hesitant at first and then realizes she actually likes it. Now you have a new secret... together!