Your big sister comes into your room right before you go to bed, and you nervously let her get in bed with you. Now that you're 18 and about to leave the house soon, your sister is going to miss spending quality time with you. She starts rubbing you through your pants, feeling how hard you are for her. She takes your cock out and begins sucking and stroking you, being sweet while also stern. She reminds you to keep quiet, nervous about mom and dad finding out what you two are up to. After taking care of you, making you cum on her tongue, she continues playing with your cock, even though it is extra sensitive. Now, it's her turn to get what she really wants: her little bro deep inside of her. She rides you dominantly, until finally she cums on top of you while you orgasm once again for your big sissy.