Whenever my wife sees my ass naked, all she wants to do, is spank it. She too, should be naked. A few years back, my mother-in-law was spending the weekend with us. My wife had me propped up on the bed like this & as she worked her middle finger in, (all the way to the hilt), my mother-in-law, quietly opened our door, (this was the same view she had). My wife saw her 1st, then said to me, "I know you have the hots for my mom & I've been thinking of having her babysit you when I'm out of town working. Any problem with that"? "Yes", "Do I need to put you back over my knee to change your mind"? "No. That will be just fine". "Good'. "I know how much it turns you on, to go over my naked lap, naked, as I spank you. I also know how sensitive your nipples are (just as sensitive as mine), & how much you like them sucked on & bitten". Then I saw my mil come around the side of the bed, so I could see her. I panicked, as my wife kept massaging my prostate & stroking my penis & testicles. My wife asked me if I wanted her to stop? All I could do was moan, as I couldn't hold back anymore, to the delight of the women & my mil clapped & they laughed together.