This is a extremely true story that happened to me when i was newly married.
My beautiful new wife wanted to buy a new bathing suit before we went on our honeymoon, so a couple of days after the wedding we went shopping together to a local womens dress/casual clothes shop.
There were gorgeous ladys walking around half dressed in the shop checking themselves out asking there mates how they looked etc,we know how women can be "does my butt look big in this/that etc etc", anyway my wife asked me to grab an outfit that we had both been looking at together, she was almost fully undressed in the change room so i went over to look for the outfit she wanted to try on, as i reached for it on the rack i looked forward and a women came out of the change room with almost nothing on,just a pair of very skimpy panties and bra, well my johnson started to stur in my jeans...She looked great..
I grabbed my wifes outfit and headed to her change room,as i got to the curtain something came over me and i looked around and no-one was there so i took my cock out and said "are you ready for this" all i heard was a low mumble i was pretty nervous but i walked in she was bending over as i tried to close the curtain at the same time my very hard cock hit her on the butt, all
of a sudden i felt a sharp pain on my face..
When i looked it wasn't my wife!! geesus. it was another women i had walked into the wrong curtain/changeroom,she screamed at me to get out you pervert etc etc,i quickly tried to put it back in my jeans as she was pushing me out of the room yelling like a crazy women,there i was stranded between all the changerooms trying to get him back in my pants as my wife walked out of the correct room next door laughing her head off, i appoligised to the wrong lady and my wife explained we had just been married and told her to please calm down it was just a mistake,(thank god i have an easy going wife) we left the store in a very big hurry laughing all the way back to our car,i have never done anything like it again i dont think i could handle the embarrisment again,it pays to make sure you have the right change room if you want to do something silly like i did!