Do you have the boardgame Trouble? If so play that, and every time you managed to sent a piece of your friend back she needs to take of a piece of clothing of her choice (same for you
). And when you get a piece into the safe zone take a item of clothing off too. The person with the most clothes remaining wins.
Oh and if you want to push it a bit feel free to touch each other as you are playing in order to annoy them