You got a date at the weekend and suspect it may end with sex - however, you're nervous as you'e never had sex before so obviously you seek advice from your big sister who, after noticing your big bulge, decides to give you a more practical lesson. After all, you've got nothing to be nervous about with your sister. Trying to stay quiet with your parents next door, she eventually begs you to cum inside of her and you give your sister a big cream pie!