You have had a bit of a crush on your new step-sister Claudia, and you swear that every time you have come into her bedroom this afternoon her tits have been bigger than they were before. That is impossible, of course, but you can hardly take your eyes off them. She smirks and teases you, telling you she can see that you’re hard through your shorts. She tells you to shut the door and confesses that they are getting bigger – she got a special vibrator, she explains – and every time she has an orgasm her tits swell even larger. She offers a demonstration, and… you can’t really say no to that, can you?