How do you proceed?

Old Rule: all women swim nude

You stare at the topless back of your admittedly hot older sister, and quickly turn away so you don’t get caught. As you do so, you get a flash of inspiration, pulling out the Rulebook once more. Turning to the “reality” page you write down “old rule: all women swim nude, apart from swimming accessories such as but not limited to; swim caps, goggles and flippers” you watch as reality shifts and turns once more to the words you have written. The top of the bikini that Robin held in her hands fades from existence as instead she pulls over a light sundress designed to be easily pulled off upon reaching the waters edge. You grin as you safely stow the Rulebook and finish packing. Somehow, you think, the yearly family get-together at Tom’s cabin isn’t going to be as lame & boring as usual