Your ditzy, slutty stepsister strikes up a conversation about how weird it is that the two of you are now "related" even though you are different races. At least now she can ask you the burning questions she has about Black guys. Most importantly, she wants to know if you all have huge dicks. You answer her question by pulling out your massive 15 inch dick to show her. She's shocked and amazed, giggling and asking if she can touch it. She asks you questions about your masturbation habits while poking at your cock. When she realizes that she's the one making it so hard, she offers to suck it for you. It's time to educate your naive White stepsister about massive black dongs by blowing your sperm straight down her throat!