Because my parents remarried, I had another stepsister. This stepsister of mine was extremely beautiful, with a big, round, and seductive butt that I always had to peek at. On top of that, she always wore short skirts that exposed her panties in front of me, so I had to try very hard to control myself. But one day, my stepsister came into my room and complained about her butt getting bigger and bigger. From the male college students to the uncles at the convenience store, everyone was staring at her butt. My stepsister had no choice but to ask me to check if her butt was normal. So the beautiful stepsister immediately brought her butt right up to my face, her cute white panties, the round butt that I had always wanted to have, were wriggling right in front of me, making me unable to control myself anymore! He immediately took off his pants and shoved his cock straight into my stepsister's pussy! And from there, their illicit relationship began. Even though she said she didn't want to, my stepsister kept exposing her big round butt in front of me, as if inviting him...