Caught masturbating by stepmom

I've been watching my hot blonde stepmom in skimpy bikinis all vacation showing off her big tits and amazing ass everywhere she goes. I just couldn't help myself to stroke my cock thinking of her until she unexpectedly catches me in the action. Well instead of her flipping out like I expected she seemed to be very turned on and since we had some time to waste she wanted to make my fantasy come true. Let me just tell you now I know why he married her.