I was at a shopping mall with my mother in law and witnessed a mother spanking her son for being bad. My MIL mentioned she hadn't spanked or seen anyone get spanked in years. I made a comment, as a joke, if she wanted me to be bad so she could spank me. She said I better not joke about or she actually will. We leave the mall and go to her house. As soon as we get there she starts talking about the spanking we saw. It appeared she still had it on her mind. She then asks me how I would feel if was actually spanked by her. I told her I didn't know and she then tells me "lets find out". I asked if she was serious and the next thing that happens is she is on the couch with me laying across her lap. She then unbuttons and unzips my pants and pulls them down, along with my underwear, just enough to expose my bare ass. She had never seen me this way before so it was a first. She begins spanking me and in a wired way it felt good. My shirt was still on and it was getting in the way of her spanking so she removed it. She continued spanking me and seemed to really be getting into it more than I ever expected. The more she spanked me the more turned on I was getting. It began to hurt but also felt really good. It wasn't long before she had pulled my pants, underwear and socks off leaving me naked across her lap with her spanking me hard. She soon had me lean up against a wall and spanked me that way. In this position she was seeing my cock for the first time ever. As she continued to spanked me she eventually grabbed my cock which was rock hard. There I was with one of my MIL's hands grabbing my cock and the other spanking me. She paused spanking me and focused on stroking my cock. We had already crossed the line but now were crossing it further. Soon I was standing there with my MIL still stroking me and me cumming. She smiled and told me I was a bad boy for doing that in front of her. She told me I would need to be spanked more but on another day. She told me to get dressed for now. I stayed a little longer but it was getting late so it wasn't long before I left.

We have been alone a few times after that day but she said when I least expect she will finish what I am still owed.