Why did this excite me?

My 78 year old mother in law was staying for a few days. She and my wife went out and I put on a pornographic movie and started to masturbate. Next thing I knew my mother in law was standing beside me, She said I’d better put “it” away or finish quickly because my wife was just putting the car away and would be inside soon. She did not bat an eye during this and kept looking at my member. I covered up quickly and greeted my wife as she came through the door. Now I cannot take my mind off my mother in law watching me masturbate. It is such a huge fantasy and turn-on. I just do not know why I get so excited!!!!

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