After Sarah walked around for a bit Jon heard a restroom stall door close and then finally the panties covering him gave way and he could see again. Of course all he saw was Sarah's legs and a gross public toilet!
As Sarah sat, Jon simply saw the toilet come closer and fill his field of vision. He could feel Sarah relax her bladder muscles right above him, neither Jon nor Karyn controlled Sara's bladder. However, both Jon and Karyn were going to be intimately involved in Sarah's urination because her two uretharas passed THROUGH them!
As Jon felt Sarah's hot piss go through him and then spray out of him he could also TASTE the piss that sprayed against his labia! Jon could also see another piss stream entering his field of vision from his side and going into the bowl. Poor Karyn was going through the same torment he was right now.
After what seemed like a long time the urine flow slowed and then turned to two twin dribbles from him and Karyn. Jon then saw a giant hand and a wad of toilet paper come towards him and wipe him down. A second later the hand returned again and wiped down Karyn next to him.
As awful as all this has been, Jon was about to see the worst thing he had ever seen in his life. As Sarah stood and shifted a bit to flush, Jon saw the stone fall out of the pocket of her clothes which were puddled around her ankles and roll into the next stall!!!
Jon and Karyn squirmed every way they could, but they had no way to warn Sarah that she had just lost the stone. As she pulled up her panties covering their vision, they did NOT feel or hear Sarah go into the other stall to retrieve the stone. Sarah had not seen it fall out of her pocket. Sarah washed her hands and left the restroom, unaware that the twitching of her new formerly Jon and Karyn pussies was not the disgust of her peeing through them, but rather the horror that their only hopes to escape their new nightmare just got flushed way.