I know you've been struggling to please daddy with your mouth, but it's okay... it's not your fault you're an inexperienced throat whore. I know you've always been too embarrassed to let loose that side of yourself. As your sister, it's my duty to teach you how to properly please a man using your mouth. And to keep you motivated daddy told me if you can't get it right with your mouth that he's not going to fuck your ass until you do. I know you can't go too long without having your ass filled. In fact, I've comprised a way to keep you concentrated on the task at hand by stimulating your ass during our tutoring session. Take this butt plug and keep yourself properly stretched. I'm going to turn your mouth into daddy's perfect fuck hole. If you do it right I will make sure daddy gives you a big reward.