Did it once to my wife, several months after we started dating. We were sleeping over in the living room at a friend's house after a party, and in the night our friend walked through the room we were in. I woke up because of the noise of his steps, but pretended to be still sleeping and rolled over, slipping the sheet off my girl. She was sleeping with only her white semitransparent lace panties on. Our friend just stopped and stood there a good minute before I heard him walk away. He has always fancied her, and I think that vision is safely stored in his spank bank.
