Your sister tells you she wants to become a nudist, but wants your permission to avoid any awkward future interactions. You tell her you are fine with it, which is when you tell her you might try it, too! Your sister is thrilled that you want to experiment living a nude life with her, and so you both get naked together... but your sister is quick to notice your hard dick, which is when she says that you might as well get it all out of your system now, and even poses for you to wank over her nude body. She teases you and spreads her asshole for you to admire, and then giggly offers a helping hand... just as long as you don't cum on her glasses!