Scenario- My wife and I started off as couples Swingers. We did MFM a couple times with my best friend Carl. And my wife surprisingly prefered it to the Swinging. I asked her one night if she'd let Carl fuck her ass as that was something we'd only done rarely. She really had to be in the mood. Well, I dared her to try and and she called my bluff. More so because she trusted Carl to, "go easy". I admit it was exciting to watch her allow another man's dick slide into her tight bung hole. Once he got his head through, you could see the relife on her face.