My wife caught me fucking her sister. She got a leather belt and started whacking my butt. Every time the belt hit my butt I jammed my hard on into her sister and she yelled in pleasure. Her sister would not let me up and my wife whipped my butt raw. It was such an erotic experience that now when I fuck my wife her sister uses the belt on me and when I have sex with her sister my wife does it. I have a very raw butt and can hardly sit down now. They make me wear pink panties now and I am at their mercy. It is gret fun but quite painful,, I can take it.