My girlfriend had always been dominant in our relationship. Dominant in everything. We were living together but on this particular day I was returning from a weeks business trip a day early. I came into the house at about 10.30 expecting her to be downstairs but it looked like she had gone up for an early night. I was quite pleased as I quickly anticipated snuggling up behind her in bed and waking her up while arousing her.
I therefore crept up stairs so as not to wake her until I was ready. When I got to our bedroom door I was surprised to see the light was on. As I opened the door there were panicked noises as she and whoever she was with tried to detach themselves from each other and cover themselves up.
There followed lots of apologies from her along with comments about not expecting me until the following day. I had still not identified her partner in crime. I said I guessed that she had not been expecting me but as they had clearly not finished their evenings entertainment not to let me stop them. More apologies and the man, who I later established was an ex-boyfriend, was frantically trying to get dressed and get out. I decided I did not want to see their efforts to clear up, so went and took a shower.
When I returned to the bedroom the man was gone and my girlfriend was sat up with tears in her eyes. She swore it was the first time she had been unfaithful to me since we had been going out and she was so sorry. She said she would do anything by way of an apology. I was still stunned but not too stunned to be furious with her. I told her to go and have a shower and wash her lover off all of her. She got out of the bed but kind of shuffled past me. I realized something was not right and understood her actions when I turned her round to see that her bottom had clearly been spanked. Instinct took over and she was across my knees as I sat on the edge of the bed.
"So you like to have your bottom spanked by your fancy man do you? You have never let me spank you but I am going to do so right now. If you ask me to stop then be prepared to leave this house tonight.
Not only was her bottom red and swollen but clearly if they hadn't finished they had been very close as her pussy was also swollen and excited. I pinned her left leg between my two legs so that my target would not be easy to move. I hit the center of her upturned bottom time and time again with a force that reflected my anger. She was screaming apologies but did not ask me to stop. I paused not for her sake but because my hand was sore.