Parents are home tomorrow so today is the final exam! The exam is all about scoring a "home run" and she is teaching her little brother by example today. He will only get an A if he can make her cum with his dick. Let's see if all those lessons stuck with her little brother. He doesn't cum from her wet blow job skills and dreamy stare...so far. He is clearly ready so she hops on her little brothers dick and starts riding him and touching her clitoris. Looking up at his big sister grinding all over him is almost too much for him to bare but she turns around to be fucked in doggy. Her pussy is so tight from the back and her butt is so big and jiggly he cums inside of her quickly and her greedy pussy eats it up. But did she cum? only way to find out is to watch... Until next semester break...