Little sister sitting on top of you

Haha, nope! You're not dreaming! It's your little sister, sitting on top of your naked, tied up body! I found you in here... Looks like she left you all tied up and gagged, but why? Well, whatever you two are into, I suppose. She left you here all by yourself, though. Do you know where she is? I sure don't. But I know you're not going anywhere! And in that case... you know what I'm into? Stealing cum, from faithful guys like you! That's exactly what's going to happen to you, so sit back and enjoy the ride. My young pussy will feel so much better than your girlfriend... Look at you. You're hard just listening to me saying these things, haha! You know what else? We have no protection! You're going to cum in an unprotected pussy and there's nothing you can do about it. Look at how hard you're trying not to! That's alright. I like a challenge...