Unspoken Rule

One of my unspoken rules is I am not to open the door if I am with King.  Honestly I keep forgetting and it is driving him nuts.   So today while we are out running errands I opened the door walking into a restaurant.  He told me right as I did it that would be one spanking.  We sat talking and eating when he told me to walk to the bathroom,  pull my pants down and spank myself 3 times.   As I walked to the bathroom I felt like I was in some movie.   But I did as I was told and gave myself 3 good whacks on my butt.  The last one really stung, then I almost felt guilty that the first one wasn't hard enough.   However I didn't want to do more than I was told either and get in more trouble...