Your sister is throwing a costume party. All of your friends are over having a great time, there's good music playing and yet, all you can focus on is your sister. Her sexy outfit, her hot gothic makeup, and the way she keeps seductively dancing, knowing how badly it is turning you on. Not to mention, she can hardly keep her hands off of you. Your sister comes up to you, teasing you, telling you how she's dancing only for you. How she wore that outfit only for you. Your cock is already achingly hard and your sister also notices that and sneakily grabs it for just a moment, in the midst of all the people at the party! She even gives you a quick kiss. Flirting with each other, touching each other, right in the middle of all your friends who don't know your true relationship, that the two of you are more than brother and sister, but are lovers, has both of you even more turned on than usual. It's not long before your sister suggests the two of you sneak away to her bedroom, which you happily agree to. Once the two of you are in her room, neither of you can deny that it is really hot taking this risk. While all your friends are downstairs, the two of you will be fucking upstairs. At any moment you could be caught. Your sister even hints that she didn't lock the door. It's more risky, and more fun that way. You and your sister kiss a little bit before she is wanting to have your big, thick cock in her pretty mouth. You lay down as she begins sucking you. Her warm mouth glides up and down on your sensitive cock. In between sucking she praises your cock. It's the most perfect dick in the world to her. The perfect length, the perfect girth. Sucking it is getting her more turned on than ever. So turned on that she can't help but touch herself while she gives you pleasure. But soon, she needs your cock to be inside of her perfect pussy. She needs to have you, her brother, pounding into her. You're both well aware that people have probably heard you by now, but it doesn't matter. You both need each other. And so, you lay your sister back and begin to pound rough and fast into her. You both need to cum, and you're going to cum together.