Step sister caught you masturbating - "I think a seducing stepsis theme would be nice, catching her stepbro masturbating watching photos of her and phantasizing about her huge boobs. She is then bending over to him and teasing him with an absolute monster cleavage. She starts caressing her boobs and teasing him softly that he should continue to stroke his cock. She also turns her back to him and he can watch her massive juggs from behind when she raises her arms in the air...... and so on"