Your sis comes downstairs in nothing but your over sized shirt and a pair of striped knee socks. She thanks you for the shirt, and you argue that it's your favorite and you never said she could have it. With a coy look, she promises to give it back, but only if you do exactly as she says. She unbuttons the shirt button by button, and then tells you to start playing with your cock. Before long, she has you slipping fingers into your ass, fingering your assholes together. She shows you how to do it, and when she thinks you've had enough, she counts you down to a hard orgasm. What brother can say no to his sister?