As the twins undressed, Ryoko opened her trunk and pulled out a cloth bag.  She tried to keep it hidden to the side, though it would be impossible for anyone to know the contents of the bag by simply looking at it.  She walked back to Rayne, trying to help him remove his belt with one hand.  After it was gone, she whispered in a low voice, low enough that only he could hear her, "Don't those two look good together?"  As she spoke, she pulled one of his hands behind his back, pulling a small loop of rope out of her bag and putting it in his hand, hopefully enough to understand what she was implying.