My stepsister is always in defenseless clothes and clingy, which is a problem for me. One day, she took advantage of the situation where we were alone and asked me to take a bath together. Of course I refused, but she said it was a bubble bath and I was wearing my swimsuit, so it was fine, so I reluctantly joined her. My stepsister was excited and excited. As she was getting excited, her big breasts popped out of her swimsuit! Of course, when she saw my erect dick, she got excited too...