My wife's been keeping a secret. Our friend, always welcome in our home, has been satisfying her carnal desires when I'm away. Tonight, I walk in on them, her riding him reverse-cowgirl, her ass slapping against his thighs. She freezes, but he keeps thrusting, and I can see her pleasure. I sit down, watching, as she takes him deeper, her body writhing, her moans filling our room.