I was in my room, minding my own business when I heard the door open. To my surprise, it was my stepsister, looking more aroused than I've ever seen her. She had this naughty glint in her eyes, and I could tell something was up. She was flaunting her big, luscious tits, and I couldn't look away. She was clearly in the mood for some action. Seeing no one else around, she decided to put on a show for me. She started touching herself, her hands exploring her body in the most intimate way. Her fingers found their way to her big, pink pussy, and she started pleasuring herself right there in front of me. Her moans filled the room as she rubbed her clit, making her big pussy lips swell. I could see her big ass bouncing with each movement, adding to the erotic display. It was a sight to behold, and I found myself getting turned on by it.