This is a true (and very hot) story about the first time I spanked my now-wife. Enjoy.
When I started dating my wife it was like most relationships. The sex was new, fun and frequent. Over the first few months nothing out of the ordinary happened. One night while we were fucking she blurted out for me to tell her she was a "bad girl" and needed to be punished. Without thinking I told her that she was a bad girl, and then just blurted out that she was my slut and that I was going to use her anyway I wanted. Well this hit a nerve, ,and she began shaking so I kept going and in about 1 minute she started to shake and cum. I said her pussy was now mine and if she was a bad girl again I would spank her. Well, she exploded, shook and when she calmed down rolled me over and sucked me off, twice, and thanked me for letting her suck me. Then she passed out.