The woman hobbles out of the room, exclaiming that she would make some herbal tea for everyone.
You suddenly have some inspiration. You are glad that your mother had made you go through all of those lateral thinking puzzles as a kid.
With a gleam in your eye, you announce your third and final wish, simultaneously getting your revenge and getting back to normal...
"I wish that all people in this room right now were cross-dressers, and that the genders of the clothes do not change." You smile all the more as your body starts to change. You feel your manhood return, and grin widely. You can immediately feel that your body is back to normal, just as it was before the couple had given you the stone.
At the same time, you hear a groan from the man in front of you. As you watch, his body starts to change, and in moments a petite chinese woman stands in front of you wearing the same clothes the man had been wearing before. His face shows his.... her fear, and she screams.
In moments, the door is swinging open, and the wife runs in, taking a moment to realise what had happened. As she falls to her knees, sobbing, you dash through the open door and make your way out of the house.