Mature stepsister exposes me in the bathroom and performs oral sex

It all started when I was taking a bath, and my stepsister decided to join me. At first, everything was fine, but then she started to expose me in front of her mom. I was caught off guard and didn't know what to do. My step-sis then took things to the next level and began to perform oral sex on me. I was taken aback at first, but then I let myself enjoy it. She was a big fan of masturbation and seemed to know just how to please me. Her body was a sight to behold - curvy with big, fat boobs and a big ass. She was definitely one hot MILF. I had never seen a woman of her age so interested in sex. It was a strange feeling, but also a very exciting one. I couldn't help but wonder if her mom had any idea what was going on behind her back.