We've had a couple of situations where my wife Kathleen has shown a bit more than expected. One of the first times was when we had some long time friends come and stay. At breakfast one morning my wife comes out the back wearing only one of those slinky satin slips, quite short. She likes me to massage her legs and so I gladly obliged. As we were sitting there with me massaging higher and higher up her thighs, I noticed that our male friend, who was deep in conversation with my wife, was paying a bit more attention to what I was doing.
My wife was sitting on a chair with both her legs layed out across my lap. I kept massaging my wifes legs, pulling them slighly apart so that I could get to the bits that she liked to have rubbed and at the same time, adjusting her slip until I was able to expose just a bit of her pussy. She hadn't noticed this but my friend sure had. For the next ten minutes or so my friend kept himself busy clearing up the breakfast dishes around the table so that he could get the best breakfast view he could. I just sat there with my wife's legs on mine as I continued to massage her.
I think all three of us got what we wanted that morning. He got to see her and we had the excitement of showing off although nothing more happneed or was spoken about.